Sanman

Hi Guys / Gals, just an update on my Timing / Idle problem - I restabbed the CAS as per Hailers advice, and nothing changed. So here's my situation now; I've checked everything I could possibly check. I've been through the whole 'fast idle when warm' section in the FSM, and have found everything in spec. However, when I checked voltages at the CPU, I found that the 5th switch readings are reversed. Has anyone ever come across this? The only thing I haven't checked / replaced are the primary injectors. Do you guys think that faulty primary injectors would cause a high idle?

BTW Thanks a lot Hailers for running that morning test for me, it saved me buying another CAS to test.

Thanks. San

HAILERS

Swap the primary with the secondarys. Its cheaper. And at the same time, replace the rubber gaskets at the bottom of the injectors to stop any air leaks. You might have something there with the injectors. Saturday, just before arriving at the house I goosed the car pretty good. In the driveway I noticed the idle was high. Bliped the thing and it still idled high. Looked at the wideband afr and it was reading 11, rich, whereas it usually reads 13.1 time after time. So I shut it off and came back a couple of hours later. Started and ran like a champ. Only thing I can think of that would cause the air fuel ratio to go to 11, would be a injector stuck. Just guessing.

If you run out of things to check, and this is a 86-88, while its idling high, lower or lean the rich/lean(variable resistor) at idle. Did the idle change??? I can vary the rich/lean screw and get 14 on the lean and 11 on the rich side of the screw. So I'm thinking that if you turn that screw and the idle changes that might give you a clue.

Sanman

I'm going to swap the pri's and the secs as the next thing I do. But if I swap them and one is stuck open, won't I still get that extra gas in there even if it's in a secondary rail? Do you think I should just try another 4 out of another car?

While I was checking the fuel pressure though, I hit the pressure release while the car was running, and the pressure dropped about 10 PSI, but the idle didn't change. I do however notice that the car is EXTREMELY rich in idle (strong gas smell, shitty mileage, and poping / backfiring). Another thing is that when I try to pressurize the system, it won't pressurize to the point where the fuel pump stops, it just keeps whirring.

San.

HAILERS

The fuel pump runs all the time as long as the engine is running or the key is held to START. Got other injectors? Yeah, try them instead.Makes more sense. As long as they are the same resistance as the ones that belong in the car.

Hope someone else will pipe in with their ideas. We're stuck in a rut here.

Sanman

I have to find other injectors first. Can I take them out of any second gen? (non GXL) Mine don't have the resistors inline. Would that be late '87 -'91?