Testing coils on a coil over plug system?

[buzzinhalfdozen]

Art, maybe try decreasing your fuel injector on time ie. leaning it out. Won't hurt anything at low RPMs. If that doesn't help try going the other way, you say you can keep it running by working the throttle... so that means it wants either more fuel or more air. By the way are you running "speed density" setup, if so maybe a MAP sensor issue? Joe

[art leong]

Originally Posted by buzzinhalfdozen

Art, maybe try decreasing your fuel injector on time ie. leaning it out. Won't hurt anything at low RPMs. If that doesn't help try going the other way, you say you can keep it running by working the throttle... so that means it wants either more fuel or more air. By the way are you running "speed density" setup, if so maybe a MAP sensor issue? Joe

I've thought about changing the injector on time, as well as changing the fuel accell enrichment. But in the past the car ran okay the way it is setup. So I want to find out what happened.
I have a hall effect cam position sensor, and a magentic crank sensor with a 20 tooth wheel. I'm going to try to check them today. And I've got a coil on plug tester on order.
I'm running in open loop (I think thats alpha N).
I have a thought that the problem has been "caused" or made worse by the use of the two step function. When I started trying it is when this problem started.
I'm on the way out right now to get a handheld laser temp gauge to check the different cylinders ( my hearders are wrapped so I can't do the spary bottle).
I trying to get another ecu to try. The map sensors are built in to the ecu.

[art leong]

Originally Posted by Ed Wright

Al, make bigger fuel pressure changes. It doesn't drop cylinders? Just dies? If it does not drop cylinders it sounds rich to me. Like Joe said, the coolant temp sensor may be out of calibration. Usually if one is too lean to idle in gear they will surge some in neutral. If you have an open in the coolant temp sensor or it's circuit the ECU will consider that -40 deg F. If that ECU has a scan function check that out. If it shows -40, take a piece of a paper clip and jumper the 2 pins in the coolant temp connector. You should then see something like 300 + deg F. If you it's the sensor. If not it is a wiring issue.

Coolant and inlet air temp sensors seem to be working fine. I've datalogged and they seem in sync with what they should be. I have the temp correction on off because I can pretty much control the coolant temp. It is setup to run at 150* to 160*
I've tried 2 different manifolds with different fuel rails injectors and inlet air sensors. I've put a timing light on it so I know nothing moved.

This problem started when I tried the launch control function on the ecu. At first it would just shut down when I got up around 3000 rpms.
I was able to put the car in gear with no problems. It only showed when I was on the 2 step. Since then it has degraded to not wanting to idle in gear at all.
I have turned off the launch control no change, removed the program and installed one that I used prior to trying the 2 step many times now. And it doesn't seem to matter.
I tend to believe I hurt something when trying the 2 step. And I'm trying to figure out what. The other day it got to where I couldn't even start it (I was actually happy I figured now I can find it) but the next morning it started. So I'm tending to think it's something heat related electrically.

[Ed Wright]

Let us know what you find out.

[buzzinhalfdozen]

Art, hows ECU are you running? Joe

[art leong]

Originally Posted by buzzinhalfdozen

Art, hows ECU are you running? Joe

When I find the problem I won't have to post it. You will hear me cheering for at least 2000 miles.

Originally Posted by Ed Wright

Let us know what you find out.

I'm using a ViPec V44 almost the same as Autronics but with a lot more options The guy that built the Autronics (Ray Hall) branched out on his own. Excellent customer support, they don't think it's in the ECU. I sent them programs and datalogs. But they are sending me another to try, if I don't get it solved in a couple of days.

[Pat Cook]

Art, this is probably a dumb question, but does it still have the lock up disc in the torque converter?

[art leong]

Originally Posted by Pat Cook

Art, this is probably a dumb question, but does it still have the lock up disc in the torque converter?

No lockup in converter. And I changed the converter That was my first suspect.
The car ran fine in the past. So I don't want to get way off base with adjustments.
I've tried to raise/lower fuel pressure, raise/lower fuel injector flow, raise/lower ignition timing. All with no improvements.
Right now I'm chasing the possibility that my LS1 coils could have been installed with reverse polarity. And when I activated the 2 step function in the ECU I might have damaged them. If they are not the problem the only thing I have left is to change the crank and cam pickups.
I've leaked down checked the motor looked at the top end for cam wear etc. Gone through the fuel system. Checked timing to see if the timing belt jumped a tooth (could not have because it would have bent valves) Checked the plug wires, changed all the plugs etc.
I hope I'm barking up the right tree with the coils.
One thing that seems to improve it a little is putting a muffler on the collector. I'm hoping that putting some back pressure on it. Allows a weaker spark to burn more mixture in the chamber and make a bit more power.

[Adger Smith]

Art,
Getting worse with heat and better when cool.... I still think Coil Temp affect has to be something in the electical controls.. Coils or sensors that time the electrical cycles being bad. I Still think the 2 step circuits in your computer are not working correctly. I would talk to the guy that did that and try to get it deactivated...completely. Get it running as a foot brake set up and then go back to the 2 step.

[buzzinhalfdozen]

Art, the LS1 coil pinout is A= ground, B=low reference to PCM, C=coil control PCM, D=Ign power or B+ The low reference on terminal B is the PCM ground for the coil. Hope this helps. BTW you stated that this all seemed to start after using the launch funtion in the ECU, in what manner does your system limit RPM? does it do Ign. only, fuel only or a combination of these?