Bowtiecrazz wrote:
So the jeep idles good when first started. Runs good down the road. Idles good in gear but after it warms up it idles rough in park or neutral. Tap the throttle a little bit it smooths out. Put it in gear it smooths out. Already did the intank pump upgrade.
Only code is p1252 I switched the vacuum lines waiting on the sensor to come in. But still not sure what is going on with the idle problem. Any help would be greatly appreciated
Fuel pressure at idle in park is 5935.7
Only code is p1252 I switched the vacuum lines waiting on the sensor to come in. But still not sure what is going on with the idle problem. Any help would be greatly appreciated
Fuel pressure at idle in park is 5935.7
Could be your serpentine belt tensioner pulley has gotten weak and allowing the serpentine belt and pulley to bounce at idle.
If the alternator override pulley is bad, it can contribute greatly to the belt and tensioner pulley bounce due to the odd pulsations of the 4 cylinder engine at idle.
To test, simply remove the serpentine belt after the engine is up to normal operating temperature, start the engine, and see if the rough idle goes away.
Note; if you hear a rattling noise at idle, it is the engine mounts, they are hydraulic and when worn out can emit a rattling sound especially at idle when the engine bounces most due to the pulsations.
