cardude43 Posted August 27, 2003 Report Share Posted August 27, 2003 My '92 GP has a 3.4 and is having idleing problems again! :verymad: Last November it did this and my mechanic said the throttle body was gunked up, so he cleaned it. Until now it had no problems and I haven't put more than 3,000 miles on the car. Okay so this is what it is doing: S.E.S. light is on; when it is in P it idles about 1,500 rpm; when it is in R it idles about 1,100 rpm; when it is N it idles about 1,500 rpm; when in OD it idles around 1,250 rpm. So, what the hell is the problem! I'm not sure whether my mechanic is right or if it's something else. Please help Quote Link to comment Share on other sites More sharing options...
Slade901 Posted August 28, 2003 Report Share Posted August 28, 2003 First, get the code of that SES light and find out which component might be failing or bad. Well, the throttle body could be gunked up again. I would do an IDLE Re-Learn as well and see if that makes a difference. Quote Link to comment Share on other sites More sharing options...
gmrulz4u Posted August 28, 2003 Report Share Posted August 28, 2003 I can almost guarantee that the code you will get is 35. The ECM always has a DESIRED IDLE speed, and code 35 will set if the actual RPMs are 200 above or below this DESIRED speed for 50 seconds. Before you run out and change the IAC Valve, make sure you do some actual diagnostic checks first... Code 35 is one of those where it could be like 8 or 10 different things... Quote Link to comment Share on other sites More sharing options...
Ribbie Posted August 28, 2003 Report Share Posted August 28, 2003 Might be one of your intake gaskets. Friend of mine had one of those and thats what he had to replace to have it behave normally. Cheers and good luck. Quote Link to comment Share on other sites More sharing options...
jeffcanada Posted August 28, 2003 Report Share Posted August 28, 2003 I also own a 3.4L. I wouldn't say that those RPM's are too erratic. A little bit high maybe, but so long as it is not wavering up in down when in a given gear I don't think this is overly bad. I've heard of some DOHC owners consistently idling above 1500 rpm (I idle around 1000). I would do another throttle body clean. Also, when you're done this unscrew the IAC and wipe of the tip of it (it is probably black and gunky), and use a screwdriver and rag soaked with TB cleaner in the passageway that you pull it out of. Jeff Quote Link to comment Share on other sites More sharing options...
cardude43 Posted August 29, 2003 Author Report Share Posted August 29, 2003 It is wavering up and down in all gears. :? Quote Link to comment Share on other sites More sharing options...
Devilsdawg Posted August 29, 2003 Report Share Posted August 29, 2003 check the codes first-change fuel filter-clean IAC an throttle boby-and by all meens check air filter an AIS (air intake sensor) Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted August 30, 2003 Report Share Posted August 30, 2003 It is wavering up and down in all gears. :? Sounds like the IAC is all gunked up. Devilsdawg, I think you meant the MAT/IAT sensor, never heard of a AIS. Robby Quote Link to comment Share on other sites More sharing options...
Slade901 Posted August 30, 2003 Report Share Posted August 30, 2003 Air Temperature Sensor Common Names: Manifold Air Temperature Sensor (MAT) Air Charge Temperature Sensor (ACT) Inlet Air Temperature Sensor (IAT) Throttle Body Temperature Sensor (TBT) Vane Air Temperature Sensor (VAT) He might meant AIS as Automatic Idle Speed sensor (AIS) OR Idle Air Control sensor (IAC). Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted August 30, 2003 Report Share Posted August 30, 2003 Air Temperature Sensor Common Names: Manifold Air Temperature Sensor (MAT) Air Charge Temperature Sensor (ACT) Inlet Air Temperature Sensor (IAT) Throttle Body Temperature Sensor (TBT) Vane Air Temperature Sensor (VAT) He might meant AIS as Automatic Idle Speed sensor (AIS) OR Idle Air Control sensor (IAC). Yeah, I was just picking nits with him Robby Quote Link to comment Share on other sites More sharing options...
Devilsdawg Posted August 31, 2003 Report Share Posted August 31, 2003 thanks slade--and i was referring to the auto idle speed sensor--sorry for the missunderstanding Quote Link to comment Share on other sites More sharing options...
jeffcanada Posted September 4, 2003 Report Share Posted September 4, 2003 If your RPM's are fluttering up and down when in a gear I would say there is a pretty good chance that you have an intake gasket leak. Not terribly fun to do on the DOHC, but gives you a chance to do some other little things while you are in there (like fuel injector o-rings, JB Welding the distributor o-ring, changing the coolant o-ring, etc). If you haven't thrown an IAC or TPS (though a bad TPS will certainly do this) code then these probably aren't the overriding source of the problem. To check for the intake leak spray TB cleaner around the sealing surface. If engine RPM's change you've got a leak. Also, check all vacuum connections; the little t-shaped bugger below the EGR Valve and adjacent to its pipe has been known to pop off. It is tough to squeeze your hand back there between the plenum and the firewall, but with patience it can be done. Jeff Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.