View Full Version : Problems
Z06scentair
11-03-2013, 07:37 PM
Drove the car around yesterday and put about 80 miles, the car is up to 19.8 k now.
Stopped and went into store came out and the car made a clunking noise while cranking, and didn't want to start. Cranked it again same clunking noise....the motor was spinning over. Third time it fired right up no clunking? Any suggestions?
Next problem is that I noticed some antifreeze and oil sitting behind the IH and cam covers drivers side? Guess its time for the plenum pull.
The car had fic injectors installed late last year. What gaskets do i need to order when pulling the plenum just uppers I'm guessing? Any other gaskets or parts that i should order?
Little vacuum leak as well and the pump cycles on and off every 10-15 seconds for about 2 seconds.
GOLDCYLON
11-03-2013, 07:50 PM
Yep plenum gaskets www.jerrysgaskets.com (http://www.jerrysgaskets.com) has em. Clunk could be a bad solenoid on the starter. Regurdless either way a plenum pull
Z06scentair
11-04-2013, 09:30 PM
Ordered plenum, IH, pvc gaskets...anything else guys?
GOLDCYLON
11-04-2013, 10:41 PM
Ordered plenum, IH, pvc gaskets...anything else guys?
New starter ?
Z06scentair
11-04-2013, 11:09 PM
Yep forgot about that but only 19k miles?
GOLDCYLON
11-04-2013, 11:11 PM
Yep forgot about that but only 19k miles?
It happens. If your wrong you always have a spare that you can rebuild. GC
Schrade
11-04-2013, 11:46 PM
Maybe break down the 'old' starter first, check the innerds, shoot some snappics and post for feedback...
I'll be in Conover for Thanksgiving 11/27-30 there Z06; be glad to stop by, unless you're done by then. PM at me here........
yzpilot
11-05-2013, 11:26 AM
This may be a stupid suggestion, but thought I would chime in. As most of you all know our Z's are super sensitive to voltage fluctuations. I know when Mike and I were trouble shooting my ECM problem, we were cranking it over several times for various tests. And out of no where and it made a horrible clunk. Scared the crap out of me! Almost sounded like the engine locked! Turned out to just be a little low voltage. 15 minutes on the charger and no problems. Not sure if this is the same clunk, but thought I would chime in! Good luck!
Z06scentair
11-05-2013, 06:54 PM
Maybe break down the 'old' starter first, check the innerds, shoot some snappics and post for feedback...
I'll be in Conover for Thanksgiving 11/27-30 there Z06; be glad to stop by, unless you're done by then. PM at me here........
Schrade thanks for the offer, my plans are to tackle this week once the gaskets arrive. You could still stop by and take a peak at the car if you would like. Love to talk cars!
Z06scentair
11-05-2013, 06:56 PM
This may be a stupid suggestion, but thought I would chime in. As most of you all know our Z's are super sensitive to voltage fluctuations. I know when Mike and I were trouble shooting my ECM problem, we were cranking it over several times for various tests. And out of no where and it made a horrible clunk. Scared the crap out of me! Almost sounded like the engine locked! Turned out to just be a little low voltage. 15 minutes on the charger and no problems. Not sure if this is the same clunk, but thought I would chime in! Good luck!
You may be right on, I will pull the starter and check it while doing the cleaning under the plenum.
I will report back once that has been completed!
XfireZ51
11-05-2013, 06:59 PM
Have a spare starter if needed.
GOLDCYLON
11-05-2013, 07:26 PM
Make a project out of it. Replace the plugs. Clean out the galley hole etc.
Z06scentair
11-05-2013, 08:12 PM
Make a project out of it. Replace the plugs. Clean out the galley hole etc.
Thats my thinking. What plugs are recommended?
Schrade
11-05-2013, 08:35 PM
Have a spare starter if needed.
How 'bout my Black carpet riser? Snappics? Price?
......................http://www.bcsalering.com/images/smilies/toetap05.gif
( sorry to boost your thread here Z06... :eusa_shhh )
Z06scentair
11-05-2013, 09:49 PM
How 'bout my Black carpet riser? Snappics? Price?
......................http://www.bcsalering.com/images/smilies/toetap05.gif
( sorry to boost your thread here Z06... :eusa_shhh )
No problem brother....hoping oneday to have an LT5 under my name. one post closer:cheers:
Z06scentair
11-06-2013, 11:22 PM
Well I found my antifreeze and vacuum leak. It was actually only the plenum bolts that were all finger loose.
By the time I found the loose bolts the plenum was almost off. So I figured I would go ahead and pull and replace the plenum gaskets. It was pretty clean underneath. I wiped everything down and took the air horn, throttle body and plenum apart for cleaning.
The throttle body was flaking paint on top around the coolant plate, so I ordered gaskets and a can of paint from Jerry's and everything arrived today. I remember someone else mentioning the pcv valve rubber gromet so I ordered it tonight. Mine was swollen to the point it was loose on both valves.
The wires look to be in good shape and the plan is to NCRS this car, so I will leave the stock wires!
As for the coils? Is there an easy way to check them?
All the vacuum lines look very good as do the connections.
It took me twenty minutes to remove the plenum, which I didnt think was too bad for my first time!:cheers:
Dynomite
11-07-2013, 03:12 AM
Before you tighten down the Plenum (with Plenum tipped up in front) and ALL vacuum lines, and DIS module connections in place....check your vacuum systems. I am killing two birds with one stone here as I posted this for Schrade also a few minutes ago.
With all vacuum lines connected, turn key on and listen for vacuum pump to shut off. If it does not shut off, start at the closest vacuum line to the vacuum pump disconnecting the line and holding your finger over the end. If the pump shuts off the leak is on other side of that. Go to next fitting and do the same until you are past the leak wherein the vacuum pump will NOT shut off. You have now located the leak.
Also check your HVAC and Cruize Control Vacuum System (check ALL connections). Also check your EVAP Purge system connections (charcoal canister which is under drivers side headlight on a 90'.....Behind Passenger Side Rear wheel on 91'). That single small vacuum port under front of plenum facing rearward (90' only) is for the Evap Purge System. The second larger vacuum port on drivers side lower front of plenum is the main vacuum line for the Charcoal Canister. The second Vacuum port right next to that Charcoal Canister port is your PCV Vacuum port.
With the key on, ground the pink wire in the green connector (third from drivers side) on ECM. This will activate the Secondaries which you can watch with the plenum tipped up in front before you bolt it down. This after you are sure you have NO vacuum leaks in the Secondary System.
I promised GC I would not mention any modifications to the New Guys .....but you should eliminate TB coolant so you do not have to mess with coolant every time you remove the Plenum......DO NOT TELL GC I suggested this. You will then be able to remove the Plenum in 10 minutes :D
Vacuum Systems 90' and 91' (Secondary and Cruize/HVAC) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-2.html#post1581460752)
GOLDCYLON
11-07-2013, 08:41 AM
The throttle body was flaking paint on top around the coolant plate, so I ordered gaskets and a can of paint from Jerry's and everything arrived today.
This is a common problem. Most of us bypassed the TB to avoid this in the future.
Z06scentair
11-07-2013, 01:19 PM
This is a common problem. Most of us bypassed the TB to avoid this in the future.
Not sure this would pass code of ethics with NCRS;)
Z06scentair
11-07-2013, 01:23 PM
Ok so I decided to change the plugs. Found a set of original plugs and went to install. Once I got to number 7, the plug cylinder and plug boot was covered in oil?
The plug was tight so that kind of ruled out blowby? I wiped it out real good and installed the new plugs, took a small paint brush and wiped a small bead of dielectric grease inside all the plug wires as well as the coil pack studs!
Z06scentair
11-07-2013, 06:27 PM
Got her back running seems to be good.....still curious about the oil in the 7 cam cover plug hole?
Dynomite
11-07-2013, 08:28 PM
Got her back running seems to be good.....still curious about the oil in the 7 cam cover plug hole?
Between the cam cover and Head....there is an "O" ring for each spark plug that is suppose to keep out oil. Sounds like you may have a bad "O" ring in number 7. That is NOT blowby but rather just oil exposed to crankcase Pressure in the Camshaft area.
Z06scentair
11-07-2013, 10:01 PM
Between the cam cover and Head....there is an "O" ring for each spark plug that is suppose to keep out oil. Sounds like you may have a bad "O" ring in number 7. That is NOT blowby but rather just oil exposed to crankcase Pressure in the Camshaft area.
So what does this job entail? And does it require immediate attention?
Dynomite
11-07-2013, 10:21 PM
So what does this job entail? And does it require immediate attention?
Depends on how much oil. It entails removing the cam covers.
It might even be possible to use silicon seal inside the spark plug hole around that joint. I guess I would try that first.
Z06scentair
11-07-2013, 11:11 PM
Depends on how much oil. It entails removing the cam covers.
It might even be possible to use silicon seal inside the spark plug hole around that joint. I guess I would try that first.
I will check it again in a couple weeks and keep you posted. I would say there was atleast a tablespoon of oil inside there!
rhipsher
11-07-2013, 11:38 PM
Check the IH bolts to make sure they have not backed out. I know for a fact that we put brand new gaskets on when I put the new injectors in. I believe the IH mount bolts are suppose to be 20 foot pounds. That could explain the coolant puddle.
Schrade
11-08-2013, 12:15 AM
Got her back running seems to be good.....still curious about the oil in the 7 cam cover plug hole?
'SEEMS' to be good? Hmmm... bad word - 'seems'. How's she idling in Closed Loop? Do you do scan software for the car?
And the part about Little vacuum leak - I think there's no such thing as 'little' vac leak in port fuel injection (although perhaps there IS such a thing as 'little' vac leak with LT5 - I don't know; really).
Dynomite
11-08-2013, 04:14 AM
I will check it again in a couple weeks and keep you posted. I would say there was atleast a tablespoon of oil inside there!
Removing Cam Cover and Camshaft Timing Inspection (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581665190)
Cam Covers (Filters and Wear Strips) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-5.html#post1581825192)
PCV system (Need for Oil Catch Can) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-2.html#post1581458205)
So.....you are pulling most oil through the Cam Cover Filters l at WOT and if you have a clogged air filter you are pulling even more vacuum at WOT from the Cam Cover vents but that is prolly just not a factor. Now if the Cam Cover Filter is clogged up, you might have a positive crankcase pressure since there is not much vacuum on the PCV system. The crankcase pressure would be greatest at WOT with the most gasses escaping into the crankcase around the rings.
In the case of a positive crankcase pressure you might see oil around the Cam Covers Or in your case.....Oil in Spark Plug Area. Just guessing here to determine what can be done if the Cam Cover Filters get clogged up Cam Cover Filters (http://www.zr1specialist.com/HAT%20Web/products/cam%20cover%20filter.htm)
It seems that the Crankcase pressure would be totally dependent on the condition of the rings. PCV valves, and Cam Cover Filters. The amount of gas passing through the PCV system and Cam Cover Vents is equal to the amount of gas passing past the rings at all times.
I switched from Scotch Brite to Marc Haibeck's new Cam Cover Vent filter material Cam Cover Filters (http://www.zr1specialist.com/HAT%20Web/products/cam%20cover%20filter.htm)
You can see a faint image around the first spark plug access hole where the "O" ring makes contact with Cam Cover.
http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite3/5507ecfb-7c0a-4330-8ba9-278d953a3d45.jpg
GOLDCYLON
11-08-2013, 08:57 AM
Not sure this would pass code of ethics with NCRS;)
Natch ;) However it solves the problem forever.... ;)
GOLDCYLON
11-08-2013, 09:01 AM
Removing Cam Cover and Camshaft Timing Inspection (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581665190)
Cam Covers (Filters and Wear Strips) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-5.html#post1581825192)
PCV system (Need for Oil Catch Can) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-2.html#post1581458205)
So.....you are pulling most oil through the Cam Cover Filters l at WOT and if you have a clogged air filter you are pulling even more vacuum at WOT from the Cam Cover vents but that is prolly just not a factor. Now if the Cam Cover Filter is clogged up, you might have a positive crankcase pressure since there is not much vacuum on the PCV system. The crankcase pressure would be greatest at WOT with the most gasses escaping into the crankcase around the rings.
In the case of a positive crankcase pressure you might see oil around the Cam Covers Or in your case.....Oil in Spark Plug Area. Just guessing here to determine what can be done if the Cam Cover Filters get clogged up Cam Cover Filters (http://www.zr1specialist.com/HAT%20Web/products/cam%20cover%20filter.htm)
It seems that the Crankcase pressure would be totally dependent on the condition of the rings. PCV valves, and Cam Cover Filters. The amount of gas passing through the PCV system and Cam Cover Vents is equal to the amount of gas passing past the rings at all times. I switched from Scotch Brite to Marc Haibeck's new Cam Cover Vent filter material Cam Cover Filters (http://www.zr1specialist.com/HAT%20Web/products/cam%20cover%20filter.htm)
You can see a faint image around the first spark plug access hole where the "O" ring makes contact with Cam Cover.
http://i287.photobucket.com/albums/ll142/dynomite007/LT5/CamcoverchainguidesP.jpg
Mr haibeck and Mr White sell the correct sponge corners. Dont use scotch brite. ive heard horror stories if they break down. Heard mind you never seen a result. GC
Dynomite
11-08-2013, 10:15 AM
Mr haibeck and Mr White sell the correct sponge corners. Dont use scotch brite. ive heard horror stories if they break down. Heard mind you never seen a result. GC
;)
Concur....I have changed that old photo as we speak as I have switched to Marc's Cam Cover Filters (http://www.zr1specialist.com/HAT%20Web/products/cam%20cover%20filter.htm) on both my 90' and 91' some time ago :handshak:
http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite3/5507ecfb-7c0a-4330-8ba9-278d953a3d45.jpg
Z06scentair
11-08-2013, 10:41 PM
Talked with Marc today and he convinced me to pull the plenum and add extra heat sink paste to the ignition module. I only installed past to the intake and I would rather air-to-caution and pull the plenum and re paste the ignition module as well.
If anyone has a bad ignition module they would donor up, I would like to give to a friend of mine to play with and see if he can study it to find out more about it. This guy is double engineer from Yale. If he does figure it out then we may be able to repair bad modules in the future.
Z06scentair
11-08-2013, 10:44 PM
Check the IH bolts to make sure they have not backed out. I know for a fact that we put brand new gaskets on when I put the new injectors in. I believe the IH mount bolts are suppose to be 20 foot pounds. That could explain the coolant puddle.
Rhipsher
You are correct the bolts were loose and that was the cause for the coolant leak....all is good now with that.:cheers: now it will be on to the oil filled spark plug tunnel!
Z06scentair
11-08-2013, 10:51 PM
'SEEMS' to be good? Hmmm... bad word - 'seems'. How's she idling in Closed Loop? Do you do scan software for the car?
I dont do software very well....:handshak: maybe when you come for the visit, you can do that for me:cheers: It runs good very smooth and the idle after a few seconds is around 800 rpms. I need to check the voltage on the tps as I had remove it.....goof up installing the tps bracket on the TB. Car was wide open at initial startup. Yeah that was scary!
Didn't find a vacuum leak but I will do me best in the morning when I remove the intake again to place more heat sink paste after the conversation with Marc Hailbeck this afternoon.
XfireZ51
11-09-2013, 12:55 AM
Talked with Mark today and he convinced me to pull the plenum and add extra heat sink paste to the ignition module. I only installed past to the intake and I would rather air-to-caution and pull the plenum and re paste the ignition module as well.
If anyone has a bad ignition module they would donor up, I would like to give to a friend of mine to play with and see if he can study it to find out more about it. This guy is double engineer from Yale. If he does figure it out then we may be able to repair bad modules in the future.
Marc has a picture of an ignition module sans the epoxy. He may possibly provide a better pic than the one on the website. A bad ignition module won't really help. Because of the environment IMs were to live in, there's really no way to disassemble one. Maybe your friend can engineer a different IM we could use w current ECM but incorporate other features like support for CnP or CoP.
Dynomite
11-09-2013, 04:08 AM
Rhipsher
You are correct the bolts were loose and that was the cause for the coolant leak....all is good now with that.:cheers: now it will be on to the oil filled spark plug tunnel!
Talked with Mark today
Would be interested in what Marc said about the oil in the spark plug area?
Just in case it happens to me :p
Z06scentair
11-09-2013, 03:37 PM
Marc has a picture of an ignition module sans the epoxy. He may possibly provide a better pic than the one on the website. A bad ignition module won't really help. Because of the environment IMs were to live in, there's really no way to disassemble one. Maybe your friend can engineer a different IM we could use w current ECM but incorporate other features like support for CnP or CoP.
If I can find one he can study, he would be glad to offer up his services!
This cat is so smart, you ask what time it is? He tells you how to build a watch...better have a half hour to blow.
Z06scentair
11-10-2013, 07:11 PM
The Infl Rest light has been on since the previous owner had the car. Today I decided to correct the code 26 which is the passanger side airbag sensor.
This sensor is mounted behind/under the blower fan assembly. Removed the inner fender, rocker panel, and side panel. I could just see the sensor up in there hiding. First step was to unhook the battery positive and negitive. Removed the front 13mm bolt no sweat. The rear 10mm was a little tougher.
I took a 10mm 3/8 drive socket and slide it back and onto the bolt removing it, and then pulling the sensor out. I then scotchbrighted the back of the sensor and frame ground mounting hole. Applied di-electric grease to both parts.
Hooked the battery back up and cleared the code 26.....and a code 12 flashed. Started the car and the Infl Rest light went out. Only light that is on now is the FULL POWER ON=D>
The total job took about two hours!
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