Dies after revving

[chadco]

Have finally worked way through cold start problem. Now that the CSV is getting power the car starts right up when cold. Have tested all components and pressures all are within specs.(WUR.AAR.CSV) My problem now is after it has warmed up and engine is at temperature, if I wick the throttle or rev it up it then drops the idle down to 0 and then tries to come back up but stalls and dies. If I try and start it again it goes up to 2000 rpm and then stalls back out immediately. I can do this over and over and it does the same thing. If I feather the gas a little at the start I can keep it running and use the gas pedal to bring it down to 1000 rpm and then it will idle fine at 950. If I rev it up again, the same thing happens all over again. The car is a Euro 79. I tried plugging off the decel valve vacuum hose as suggested in another post but it made no difference. I have recently gone through the entire CIS system and replaced all the components other than the box itself. I am trying to test in now on the car to see if it has any leaks bringing unmetered air into the system. Any other ideas what might be my problem? The car does not have computer or 02 sensor on this year model.
Thanks, Chad.

[timmy2]

What is your warm CO reading?
Sounds like you may be running rich.

[JohnJL]

Did you recently have a lightweight flywheel installed?

[chadco]

Timmy2 you are right on. I just came back in from testing the fuel accumulator to see if it was working properly. The diaphragm is good, so it's ok. I then thought the same thing that maybe it was too rich. I backed off the allen screw by 1/8th turn increments until it stopped stalling. I have went back about 4 - 1/8th turns and now it stays running. It still dips down below the 950 after revving, but only to about 400 then it returns back to the 950 rpms. I don't have a Co2 meter to check to see where it is at. Do you think I should turn it back another 1/8 turn to see if it will not dip at all or just leave as is until I can take it in to have it placed on a Co2 meter? It makes sense that it was too rich because when the shop got it running after so many years of sitting they had to adjust it richer to make up for the small air leaks that were coming in around the old sleeves and o-rings that the fuel injectors were sitting in. Now all that is new and hopefully no more air leaks.

[Bob Kontak]

Nice work Timmy2.

Here is a good thread on setting your CO without an analyzer.

CIS Idle Speed and Mixture Setting Without an Analyzer

[timmy2]

Lol Bob,
I just spent the day Sunday testing a local members fuel pressures and CO, so it was at the front of my brain.
If it is runnig well I would leave it and beg borrow or steal a Gunson CO analyzer to check it properly.
(Or a better machine) if you were local I'd let you use mine. They are pretty cheap on eBay as far as a diagnostic tool is concerned.
I set mine up before having the Gunson using the method Bob linked you to, and came out 1/2 a point above what turned out to be ideal for my car (around 3.5) I was running it at 4.0 when I tested it.

[T77911S]

its too rich.

a lot of things going on here.
did it do this before? this really may not matter since you have done so much work and you may have fixed an air leak, which would make it run rich. the other thing is i dont know what you did to fix the CSV but just make sure it is not on all the time. i know its not likely but just gotta ask.


you can remove the air filter and pull down on the sensor plate to lean it out at idle.
and/or you can tunr the mixture CCW 1/4 turn. you may need to do that twice as it sounds like it is very very rich i only say to so this at this point since you have done so much and most likely the mixture has been adjusted to compensate. just make a reference of the angle of the allen so you can put it back if you need to.

i always adjusted my mixture on the rich side of JUST wanting to drop on RPM and come back up like yours is doing, and no surging at idle. IE, set it rich and keep going lean until the RPMS dont drop.

[boyt911sc]

Chad,

You are doing great!!!!! The fuel mixture adjustment thread posted by Bob K. is a good procedure except the original poster over looked to include checking for vacuum leak/s. Dennis P. has done this procedure many times. Without testing and verifying the absence of vacuum leak in the system, you are hoping you don't have any. It could be the case but you don't know that for a fact.

You have located and identified the root cause of the problem causing your CSV to be inoperative during starting. Now, it has been corrected. You would have not known the culprit if you did not perform the tests suggested to you. Test and confirm is my motto for CIS troubleshooting. Keep us posted.

Tony

[timmy2]

I need to know, why wasn't the CSV getting power.
I didn't see a post as to how you fixed it.

[boyt911sc]

Originally Posted by timmy2

I need to know, why wasn't the CSV getting power.
I didn't see a post as to how you fixed it.

Dennis,

It was determined that the wire between terminal #16 (starter) and the CSV was not allowing current to flow through. Several tests were done to confirm this anomaly. Chad did all the work. All I did was laid out several tests for him to perform one after the other to determine the culprit. Test results confirmed that there was a 'break' in the line. So Chad installed a secondary yellow wire between terminal #16 and CSV. And the CSV is now operational during start.

There were several emails and phones calls between us to discuss the test plans and the results. He did all the work and did it very well.

Tony

[timmy2]

Thanks for the info Tony.
It helps others to know what the final problem was and how it was resolved.