1990 Chrysler New Yorker Engine runs rough when cold.

Has the check engine light come on?

No check engine light. I had the fuel pressure checked and it was great. I also changed the tempurature switch but i was told that is just for the guage, which i found to be true that the temp guage runs off the temp switch, not sure if anything else runs off the temp switch though.

There is a temp sensor that tells the computer how rich to run the fuel mixture based on temp. Cars with fuel injection don't have a choke like the old ones. If that is ok, I would check for vacuum leaks.

Yeah the coolant temp sensor is for the fuel rich/lean, that was replaced. The temp switch is for the guage.

Also i want to point out that sometimes when i first start the car it will run fine for a minute or 2 and then runs rough and you can hear the air intake sucking air loudly. The idle will go up and down also. This has not happened in a while.


I will check for Vacuum leaks and get back to ya. As far as i know there wasnt any but ill double check.

Thanks

Check the EGR valve too for it sticking. Timing and vacuum leaks are good for causing backfires.

Let me know what you find.

Joe

I looked for the EGR valve and have great knowledge of cars and engines and couldnt seem to find it. I looked in my Haynes repair manual and where it shows the egr valve for a 3.3L engine there is none. Hynes Manual shows it bolting to the top of the air intake and there is a bolt hole and a electrical hook up, but no valve. I swear i thought i saw it on that car before but i looked as best i could and couldnnt see it.

There is no vacume lines unhooked as if it were to go to the egr valve. I will have a mechanic friend show me where it is ifmy car has one.

The repair manual says some of the problems of a bad egr valve is rough idling and car stalling and stuff, it was making me think it was the egr valve until i couldnt find it.

these vehicals do not have a egr valve unless its from california