STILL NO SPARK ON TWO CYLINDERS - Page 2 - ZR-1 Net Registry Forums

SDZR-1 · 09-19-2007

Quote:

Originally Posted by Kevin

Stupid question, how did you determine you didn't have spark?

took plug wire off of plug and listened for spark....didnt hear any, so pulled the wire out, stuck a screwdriver in the end to double check that way. I had nothing on either cylinder.

Kevin · 09-19-2007

I was going to suggest arking off the block but the screwdriver does the same thing. Coils rarely go bad.

SDZR-1 · 09-19-2007

OK...I swapped ecm's w/ another 91 and it didnt change anything...so what next?

Kevin · 09-19-2007

Quote:

Originally Posted by SDZR-1

OK...I swapped ecm's w/ another 91 and it didnt change anything...so what next?

Start checking injectors

SDZR-1 · 09-19-2007

i've replaced all...and have tested, they all work.

Kevin · 09-19-2007

are the connections all good?s

SDZR-1 · 09-19-2007

Quote:

Originally Posted by Kevin

are the connections all good?s

yes...i specifically listened for the metal retainer to click on each one of them.

tccrab · 09-20-2007

It will only be one of three things, air, spark or fuel.
You can rule out air so that leaves spark or fuel.
Idle the car for a little while then pull plugs #2 & #5. If they're wet then you know for sure that you've got fuel.
You've swapped ECM's so you can rule out a problem with ECM injector drivers, but this does not rule out a problem with your PROM. See if you can borrow one of those too.

So that leaves spark.
Check the gap on your plugs. Are they the right plugs? Do the spark plug wires make good connection? Do you have the right wires going to the right plugs? (stupid question, but you gotta ask)
Buy a NOID, you can find them at your local parts store:
http://www.drivewerks.com/catalog/sh...AT447_pg28.htm
This will tell you for SURE if you've got spark at the plugs.
Change the order of the coil packs, see if the miss follows the coils. This will tell you if it's coil related or if it's signal related. ( I know this means pulling the plenum...again...)
While you've got the plenum off, be sure to measure the spark plug wires with an ohm meter, make sure they're all fairly close in ohms. You might have bad wires (not likely).
Closely examine the DIS module and it's connectors. JeffVette has already ID'd the one likely culprit wire.
I dont' know off hand how to diagnose the DIS module, maybe someone else can chime in on this.
If the problem is deeper it might be time to take it to a PRO.

SDZR-1 · 09-20-2007

Quote:

Originally Posted by tccrab

It will only be one of three things, air, spark or fuel.
You can rule out air so that leaves spark or fuel.
Idle the car for a little while then pull plugs #2 & #5. If they're wet then you know for sure that you've got fuel.
You've swapped ECM's so you can rule out a problem with ECM injector drivers, but this does not rule out a problem with your PROM. See if you can borrow one of those too.

So that leaves spark.
Check the gap on your plugs. Are they the right plugs? Do the spark plug wires make good connection? Do you have the right wires going to the right plugs? (stupid question, but you gotta ask)
Buy a NOID, you can find them at your local parts store:
http://www.drivewerks.com/catalog/sh...AT447_pg28.htm
This will tell you for SURE if you've got spark at the plugs.
Change the order of the coil packs, see if the miss follows the coils. This will tell you if it's coil related or if it's signal related. ( I know this means pulling the plenum...again...)
While you've got the plenum off, be sure to measure the spark plug wires with an ohm meter, make sure they're all fairly close in ohms. You might have bad wires (not likely).
Closely examine the DIS module and it's connectors. JeffVette has already ID'd the one likely culprit wire.
I dont' know off hand how to diagnose the DIS module, maybe someone else can chime in on this.
If the problem is deeper it might be time to take it to a PRO.

when I swapped ecm's, i took the whole thing from the other car including it's prom (which was also a 91). As far as checking plugs after running...I have done that - - -and yes, they are wet...so that leaves spark. The plugs are correct, the gap is correct....just not getting any spark through the wires. I changed each wire one at a time measuring each old one w/ a new one of the same length. I just dont know how badly I want to pull everything apart and going in blind. Perhaps I'll have to load it up and take it to a shop, but at this point I doubt they would know much about the car and I'd end up w/ one hell of a labor bill. Just hanging around the forum here has taught me many things and I appreciate every bit of everyones help and advice.

guinnessdood · 09-20-2007

Marc Haibeck has a DIS module he loans out if you think that could be the issue. www.zr1specialist.com of course if you have a ZR-1 there and the owner will let you remove the plenum...then that would work too....the DIS module is mounted on the underside of the plenum.

09-19-2007	#12
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	Re: STILL NO SPARK ON TWO CYLINDERS I was going to suggest arking off the block but the screwdriver does the same thing. Coils rarely go bad. __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

09-19-2007	#13
SDZR-1 Join Date: Aug 2007 Location: Bison, SD Posts: 106	Re: STILL NO SPARK ON TWO CYLINDERS OK...I swapped ecm's w/ another 91 and it didnt change anything...so what next?

09-19-2007	#15
SDZR-1 Join Date: Aug 2007 Location: Bison, SD Posts: 106	Re: STILL NO SPARK ON TWO CYLINDERS i've replaced all...and have tested, they all work.

09-19-2007	#16
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	Re: STILL NO SPARK ON TWO CYLINDERS are the connections all good?s __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

09-20-2007	#18
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,657	Re: STILL NO SPARK ON TWO CYLINDERS It will only be one of three things, air, spark or fuel. You can rule out air so that leaves spark or fuel. Idle the car for a little while then pull plugs #2 & #5. If they're wet then you know for sure that you've got fuel. You've swapped ECM's so you can rule out a problem with ECM injector drivers, but this does not rule out a problem with your PROM. See if you can borrow one of those too. So that leaves spark. Check the gap on your plugs. Are they the right plugs? Do the spark plug wires make good connection? Do you have the right wires going to the right plugs? (stupid question, but you gotta ask) Buy a NOID, you can find them at your local parts store: http://www.drivewerks.com/catalog/sh...AT447_pg28.htm This will tell you for SURE if you've got spark at the plugs. Change the order of the coil packs, see if the miss follows the coils. This will tell you if it's coil related or if it's signal related. ( I know this means pulling the plenum...again...) While you've got the plenum off, be sure to measure the spark plug wires with an ohm meter, make sure they're all fairly close in ohms. You might have bad wires (not likely). Closely examine the DIS module and it's connectors. JeffVette has already ID'd the one likely culprit wire. I dont' know off hand how to diagnose the DIS module, maybe someone else can chime in on this. If the problem is deeper it might be time to take it to a PRO.

09-20-2007	#20
guinnessdood Join Date: Oct 2004 Location: Woods Cross, UT Posts: 389	Re: STILL NO SPARK ON TWO CYLINDERS Marc Haibeck has a DIS module he loans out if you think that could be the issue. www.zr1specialist.com of course if you have a ZR-1 there and the owner will let you remove the plenum...then that would work too....the DIS module is mounted on the underside of the plenum.