idle issues

[cooliomo]

alright i have a 92 galant its bone stock. my situation is that when i drive my car hard or long trips i turn it off, and turn it on it idles like at 400-500 rpm until i blip the throttle. ive done most of the maint spark plugs, wires, air filter.(not the fuel filter will do soon). but any idea what it could be?

 

my car does the same thing. it doesnt bother me though because im one of the few local 4g owners that has a car that idles under 1k rpm. have you tried adjusting your biss screw?

 

[Brunoboy]

mine does it too, but maybe its because i dont have the FPR Solenoid anymore. I heard something about it bumping fuel pressure when its hot or something.
-shane

 

Yes, that's the first thing to check. The ECU closes the FPR solenoid for the first 3 minutes after a hot start, to help with vapor lock/fuel percolation issues. Even with the solenoid working you may have issues. Our cars run extremely hot under the hood, and when you stop moving all the heat really soaks everything in there.

 

[cooliomo]

hhmm ok well there has been times when is cold and i need to be somewhere and the car hesitates and buck only at a certain rpm 2000-3000, i did replace my biss screw with a new one from the dealer, i believe that i set it a the right idle rpm about 750, but when there is a load like lights heater defogger, it idles at 600 the car shakes, but when i drive it for a few minutes and come to a stop light the car idles fine???

 

[DR1665]

Quoting keydiver:
Yes, that's the first thing to check. The ECU closes the FPR solenoid for the first 3 minutes after a hot start, to help with vapor lock/fuel percolation issues. Even with the solenoid working you may have issues. Our cars run extremely hot under the hood, and when you stop moving all the heat really soaks everything in there.



So what's the remedy for this issue, if any? I've got a good IAC and the BISS is set fine. For the most part, the car idles at 800rpm like a rock, but shut it off in a parking lot, come back out five, ten minutes later, and the idle drops to 500 or less and, in some instances, dies. Really annoying.

Could the FPR solenoid be opened up or eliminated? Pros and cons to elimination if even possible.

I'd been thinking about posting this very question recently, but was going to do some research first. /ubbthreads/images/graemlins/smile.gif

 

[raptorWagon]

If I recall, the fpr solenoid can be eliminated with no ill effects other than the occasional extra crank on a hot start. I know I researched it when I was deleting all the unnecessary vac lines.

 

i blame fiav for that! i had the same problem till i blocked my fiav then it idleed like a champ at 800!

 

[cooliomo]

Quoting DR1665:
Quoting keydiver:
Yes, that's the first thing to check. The ECU closes the FPR solenoid for the first 3 minutes after a hot start, to help with vapor lock/fuel percolation issues. Even with the solenoid working you may have issues. Our cars run extremely hot under the hood, and when you stop moving all the heat really soaks everything in there.



So what's the remedy for this issue, if any? I've got a good IAC and the BISS is set fine. For the most part, the car idles at 800rpm like a rock, but shut it off in a parking lot, come back out five, ten minutes later, and the idle drops to 500 or less and, in some instances, dies. Really annoying.

Could the FPR solenoid be opened up or eliminated? Pros and cons to elimination if even possible.

I'd been thinking about posting this very question recently, but was going to do some research first. /ubbthreads/images/graemlins/smile.gif



ya thats dead on lol