Problem at idle [help needed]
Thread Starter
Racer
Joined: Oct 2009
Posts: 430
Likes: 0
Problem at idle [help needed]
Hi guys.
I think that i've got a new problem, now, my car (with hot oil), goes to 1.100 RPM (at idle, in stead of 900 RPM), and it sounds more like "pro pro pro" (Like a Harley Davidson) in stead of "propropropro", and too, it does more backfires. (it has tip gearbox)
Could it be a rotor or distributor caps? which are the symptoms of a distributor belt broken?
Regards!
I think that i've got a new problem, now, my car (with hot oil), goes to 1.100 RPM (at idle, in stead of 900 RPM), and it sounds more like "pro pro pro" (Like a Harley Davidson) in stead of "propropropro", and too, it does more backfires. (it has tip gearbox)
Could it be a rotor or distributor caps? which are the symptoms of a distributor belt broken?
Regards!
Racer
Joined: Sep 2006
Posts: 383
Likes: 0
From: UK
Sounds like an intake air leak. Take a look at this thread for a possible solution.
https://rennlist.com/forums/964-foru...l-no-luck.html
https://rennlist.com/forums/964-foru...l-no-luck.html
Pro
Joined: May 2009
Posts: 510
Likes: 0
From: Raeford, North Carolina
Possibly, my idle was erratic, and then the car would just die at traffic lights. It would start right back up, but it could not maintain idle. I had the shop hook it up to the computer and it said a bad O2 sensor, replaced it and no problem.
It is worth a try, and if it hasn't been replaced yet on the car it won't hurt to replace it anyways.
Cheers
It is worth a try, and if it hasn't been replaced yet on the car it won't hurt to replace it anyways.
Cheers
Last edited by ian89C4; Nov 6, 2010 at 05:55 PM.
Rennlist Member
Joined: May 2007
Posts: 2,296
Likes: 37
From: Portland, Oregon
I would still check for vacuum leaks, and if you're not sure about your distributor belt, it's really worth checking, as a broken one can really cause some problems. Though I would agree with Ian on an O2 sensor...
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Thread Starter
Racer
Joined: Oct 2009
Posts: 430
Likes: 0
I checked my idle switch, it does "click" when it closes.. so... 02 Sensor 100%?
When I start it sometimes do a backfire.. I think that only can be the 02 sensor, because my idle switch is OK, y cleaned the idle regulator.. and my distributor belt is fine.. so.¿could be a rotor or a cap distributor? I think no but I have yo ask..
Regards!
When I start it sometimes do a backfire.. I think that only can be the 02 sensor, because my idle switch is OK, y cleaned the idle regulator.. and my distributor belt is fine.. so.¿could be a rotor or a cap distributor? I think no but I have yo ask..
Regards!
Burning Brakes
Joined: Feb 2003
Posts: 985
Likes: 1
Based on the information you've provided, I'd be searching further for a vacume leak as the backfire and the shhhh sound (i.e. although somewhat subjective and difficult to put a sound into words) are tell tale signs.
Addict
Rennlist Member
Rennlist Member
Joined: Jul 2003
Posts: 2,577
Likes: 52
From: Atlanta
Troubleshooting is cheap and quick. Replacing the wrong parts is expensive and time-consuming.
Read the disgnostic codes. They will tell you in plain English if it is the O2 censor, one of the Hall sensors, the CHT or other sensor. The code reader lets you check each injector, actuator, and switch.
If that does not get to root cause, some basic troubleshooting is in order. Are you sure there is not a vacuum leak? Symptoms are consistent with that. Check fuel pressure and fuel flow, and while you are at it, check for water in the fuel. Check the compression. Check the spark timing. If you are still not at the solution, an ignition scope will pinpoint ignition and fuel problems cylinder-by-cylinder.
Good luck. I love this site because it does identify the common problems and lets you avoid the pitfalls that make ownership less fun and more expensive
Read the disgnostic codes. They will tell you in plain English if it is the O2 censor, one of the Hall sensors, the CHT or other sensor. The code reader lets you check each injector, actuator, and switch.
If that does not get to root cause, some basic troubleshooting is in order. Are you sure there is not a vacuum leak? Symptoms are consistent with that. Check fuel pressure and fuel flow, and while you are at it, check for water in the fuel. Check the compression. Check the spark timing. If you are still not at the solution, an ignition scope will pinpoint ignition and fuel problems cylinder-by-cylinder.
Good luck. I love this site because it does identify the common problems and lets you avoid the pitfalls that make ownership less fun and more expensive
Burning Brakes
Joined: Feb 2003
Posts: 985
Likes: 1
In addition to the vacume lines have you checked the 6 rubber intake tubes between the intake plenum and the intake ports? Check that the clamps are tight and there are no cracks in the rubber? Is it a backfire or a missfire? In other words does it "bang" when you let off on the throttle or when you're applying throttle and the engine rpm is increasing? Or is it "banging" when idling?