Low Idle Problem
#1
09-19-2012 | 10:22 PM
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Junior Member
Joined: Sep 2012
Posts: 1
Low Idle Problem
Hi I'm at a loss with my car and need some advise. I have a 2002 s series with 106,000 miles,automatic transmission. It recently started to idle around 500 rpm when I stop at red lights it sometimes stalls on me but it I shut everything off and start again it starts right up.
I had a engine light on for the crankshaft sensor so that was replaced and light went off...havent had and codes since but is still happening.
So far:
replaced oil filter and changed oil
replaced tranmission filter and changed fluid
replaced air filter
replaced iac valve
replaced crankshaft sensor
replaced throttle body position sensor
cleaned throttle body
used injection cleaner in gas tank
replaced fuel filter
replaced coolant temp sensor
a couple of side notes not sure if they matter but....I hadnt used my ac in about 3 yrs,I had freon put in it and it worked great but than this happened about 3 weeks later. Also Ive noticed that when I either go from park to drive or vise versa my lights on my dash board dim for a second.
and my coolant light on my dash came on a few times, but when I checked it was still full.
the other day it was raining so I had to out on the heat to de-fog my windows and I forgot that the heat was on til the next day....I noticed though that when the heat was on it idled normal about 800-900 and when I shut the heat off it dipped back down to around 400-500???
when I replaced the coolant temp sensor now if nothings on or the heats on it idles around 300 and shakes like its going to stall,but if I put the ac on it idles around 700.
Need help, no idea what to do next!
I had a engine light on for the crankshaft sensor so that was replaced and light went off...havent had and codes since but is still happening.
So far:
replaced oil filter and changed oil
replaced tranmission filter and changed fluid
replaced air filter
replaced iac valve
replaced crankshaft sensor
replaced throttle body position sensor
cleaned throttle body
used injection cleaner in gas tank
replaced fuel filter
replaced coolant temp sensor
a couple of side notes not sure if they matter but....I hadnt used my ac in about 3 yrs,I had freon put in it and it worked great but than this happened about 3 weeks later. Also Ive noticed that when I either go from park to drive or vise versa my lights on my dash board dim for a second.
and my coolant light on my dash came on a few times, but when I checked it was still full.
the other day it was raining so I had to out on the heat to de-fog my windows and I forgot that the heat was on til the next day....I noticed though that when the heat was on it idled normal about 800-900 and when I shut the heat off it dipped back down to around 400-500???
when I replaced the coolant temp sensor now if nothings on or the heats on it idles around 300 and shakes like its going to stall,but if I put the ac on it idles around 700.
Need help, no idea what to do next!
#2
09-19-2012 | 11:28 PM
Banned
Joined: Jul 2008
Posts: 2,748
From: Riveria of America
OK -- You're going to have to be the eyes and ears ...
1) Check the serpentine belt and replace it if worn ...
2) Check the main positive battery cable, and replace it if you find that it seems brittle or crunchy. Acid has possibly gotten under the cable jacket, and is eating the cable up, kinda like termites in a 2x4 ...
3) You should have replaced the ECTS electrical connector at the same time as you replaced the ECTS, because something is not making proper contact in that circuit.
NOTE-- The small increase you see in engine RPM when you turn on the A/C is normal
1) Check the serpentine belt and replace it if worn ...
2) Check the main positive battery cable, and replace it if you find that it seems brittle or crunchy. Acid has possibly gotten under the cable jacket, and is eating the cable up, kinda like termites in a 2x4 ...
3) You should have replaced the ECTS electrical connector at the same time as you replaced the ECTS, because something is not making proper contact in that circuit.
NOTE-- The small increase you see in engine RPM when you turn on the A/C is normal
#3
09-20-2012 | 06:19 AM
Senior Member
Joined: Mar 2006
Posts: 3,278
From: Arizona
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