Engine Ticking - Page 6 - ZR-1 Net Registry Forums

XfireZ51 · 08-06-2015

Quote:

Originally Posted by Dmod81

I have not, but I just got a can of the stuff that you can spray into the intake. It has the long straw with the bend in it.

Quote:

Originally Posted by XfireZ51

Yep!

I also removed one of the oil tube hoses and sprayed it through the the airborne opening. Just need to keep motor running.

Dmod81 · 08-26-2015

The bog after coasting is back (well, actually, when I thought it was gone, I wasn't off of the throttle enough for it to appear, still have a rough idle as well). It bogs if I let off the throttle and for more than about 3 seconds.

I finally got some time to datalog the car. What I think (because I have no clue how to really interpret the graphs) I'm seeing is that when I go off throttle, the O2s either go erratic, or low or high, and the integrators start dropping sharply. Then when I get back on throttle, the RPMs don't increase until the integrators start coming up some. Also at cruise, the O2s are cycling only about once per second (thanks to Marc for pointing that out).

(Integrators, RPM and TPS % on top, and O2 voltages and map on bottom)

Bog 1:

Integrators dropping further the longer I'm off throttle:

Everytime you see the throttle being depressed here, the car was bogging until the integrators got back up to normal and the O2s started cycling again:

Cruise:

XfireZ51 · 08-27-2015

So you ported the top end, what changes were made to the calibration?

Dmod81 · 08-27-2015

I have Marcs normal BPPAG4 cal with custom settings:
Add fuel for headers
Fuel for cats
Enable anti-backfire mode
Add Fuel for top end porting
Secondaries removed
750 rpm idle
7200 rpm rev limit

Bearly Flying · 08-27-2015

Just a shot in the dark..What brand of O2 sensors are you running?

My car, after porting it, did exactly the same thing.

There is a thread on the forum about the recommended O2 sensors, I put those in and no more problem.

Dmod81 · 08-27-2015

They are new densos. I had the same issue with the old ones that were in there too, but I'm not sure which brand those were.

Dmod81 · 09-20-2015

OK, so I replaced the O2 sensors with OE type AC Delcos and also tightened the header bolts. Several were slightly loose. This seemed to have helped the problems a lot, but was not a 100% fix. It stumbled only once on the test drive, and there was no ticking or missing to be heard.

Unfortunately, on the next drive, everything was back to how it was before. So I seafoamed again and noticed a small amount of smoke was coming up next to the engine on the passenger side. So I took a look and noticed the header flange at #6 is dirty and wet:

Sorry for the poor quality, I was using a cheap snake camera hooked to my phone. For comparison, here's #4 and #1:

So its really only # 6 that is wet. Is it possible that after I tightened the bolts they loosened up again/ or the gasket is now damaged? Could a leak there cause a miss and stumble after getting on the throttle after coasting? I find it interesting that that cylinder is the one that had the original dead miss.

08-26-2015	#52
Dmod81 Join Date: Mar 2010 Location: Colorado Springs CO Posts: 76	Re: Engine Ticking The bog after coasting is back (well, actually, when I thought it was gone, I wasn't off of the throttle enough for it to appear, still have a rough idle as well). It bogs if I let off the throttle and for more than about 3 seconds. I finally got some time to datalog the car. What I think (because I have no clue how to really interpret the graphs) I'm seeing is that when I go off throttle, the O2s either go erratic, or low or high, and the integrators start dropping sharply. Then when I get back on throttle, the RPMs don't increase until the integrators start coming up some. Also at cruise, the O2s are cycling only about once per second (thanks to Marc for pointing that out). (Integrators, RPM and TPS % on top, and O2 voltages and map on bottom) Bog 1: Integrators dropping further the longer I'm off throttle: Everytime you see the throttle being depressed here, the car was bogging until the integrators got back up to normal and the O2s started cycling again: Cruise:

08-27-2015	#53
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,683	Re: Engine Ticking So you ported the top end, what changes were made to the calibration?

08-27-2015	#54
Dmod81 Join Date: Mar 2010 Location: Colorado Springs CO Posts: 76	Re: Engine Ticking I have Marcs normal BPPAG4 cal with custom settings: Add fuel for headers Fuel for cats Enable anti-backfire mode Add Fuel for top end porting Secondaries removed 750 rpm idle 7200 rpm rev limit

08-27-2015	#55
Bearly Flying Join Date: Dec 2012 Location: Ponoka, Alberta, Canada Posts: 158	Re: Engine Ticking Just a shot in the dark..What brand of O2 sensors are you running? My car, after porting it, did exactly the same thing. There is a thread on the forum about the recommended O2 sensors, I put those in and no more problem.

08-27-2015	#56
Dmod81 Join Date: Mar 2010 Location: Colorado Springs CO Posts: 76	Re: Engine Ticking They are new densos. I had the same issue with the old ones that were in there too, but I'm not sure which brand those were.

09-20-2015	#57
Dmod81 Join Date: Mar 2010 Location: Colorado Springs CO Posts: 76	Re: Engine Ticking OK, so I replaced the O2 sensors with OE type AC Delcos and also tightened the header bolts. Several were slightly loose. This seemed to have helped the problems a lot, but was not a 100% fix. It stumbled only once on the test drive, and there was no ticking or missing to be heard. Unfortunately, on the next drive, everything was back to how it was before. So I seafoamed again and noticed a small amount of smoke was coming up next to the engine on the passenger side. So I took a look and noticed the header flange at #6 is dirty and wet: Sorry for the poor quality, I was using a cheap snake camera hooked to my phone. For comparison, here's #4 and #1: So its really only # 6 that is wet. Is it possible that after I tightened the bolts they loosened up again/ or the gasket is now damaged? Could a leak there cause a miss and stumble after getting on the throttle after coasting? I find it interesting that that cylinder is the one that had the original dead miss.