1990 Chrysler New Yorker Surging Idle

CHRYSLER NEW YORKER
Avatar
STOLENFAITH
  • MEMBER
  • 3 POSTS
I have a 1990 chryler newyorker with 160,000 miles on it that when i start it the car idles bad up then down then up then down lol you get the picture and if i shut it off and then start it again it idles fine it happens worse when hott out any help i would appreciate thanks :D
Aug 3, 2006 at 1:56 PM
Advertisement
Avatar
SYNCRAIT
  • ✓Experienced Mechanic
  • 235 POSTS
check for broken vacuum lines and also check/replace your PCV valve. Both will make your idle go nuts.....good luck :)
Aug 17, 2006 at 1:54 AM
Avatar
NOS
  • ✓Experienced Mechanic
  • 320 POSTS
i'am going to assume that the engine is a 3.3 v6 it or is it a 318 sounds like you may have a fuel pressure problem when you first start the car the pressure has bleed off and and won't idle when you start it again it gets time to prime the system. pressure should be about 35 to 40 psi and peak at top pressure when the vaccum line is removed from the fuel pressure regulator a clogged fuel filter will also cause this and possibly a IAC motor which is (idle air control).(NOS) and the amount of miles on the car plays alot into it just like us when we get old stuff wears out.
Sep 12, 2006 at 1:58 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.

Suggested Repair

Inspect for broken vacuum lines and check or replace the PCV valve. Also test fuel pressure (about 35-40 psi, including with the regulator vacuum line removed), and check the fuel filter, fuel pressure regulator, and idle air control (IAC) motor.

Conversation Summary

A 1990 Chrysler New Yorker with 160,000 miles surges up and down at idle after starting, worse in hot weather, but idles normally if shut off and restarted. Experts suggested checking vacuum lines and the PCV valve, and also considering a fuel-pressure bleed-down or priming issue, a clogged fuel filter, the fuel pressure regulator, and the IAC motor.

Related Repair Questions

Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle