long term idle problem

[jaydog92ex]

hey fellas,
i have had a problem with my car at idle. just when its idleing, it has a small miss. its not missing constantly though when its at idle. it will like miss twice then once then over again. it does this in all kinds of weather. regular driving it does fine. i have given it a full tune up including a new fuel filter(which was a bitch). everything but the timing belt. could it be my timing belt worn out or something else. like i said, its only when it idles.

[BustedLX]

Re: long term idle problem

Originally posted by jaydog92ex
hey fellas,
i have had a problem with my car at idle. just when its idleing, it has a small miss. its not missing constantly though when its at idle. it will like miss twice then once then over again. it does this in all kinds of weather. regular driving it does fine. i have given it a full tune up including a new fuel filter(which was a bitch). everything but the timing belt. could it be my timing belt worn out or something else. like i said, its only when it idles.

Hmmm... a miss only at idle, that's wierd. You replaced your plugs, wires, cap, rotor, all that stuff? Have you tried running some fuel injector cleaner threw it? It could be a clogged injector. Are you throwing any trouble codes?

[cp[mike]]

last year brought my toyota in for a tune up, they replaced the air filter, plugs, wires, fixed an exhaust leak, did other little tuneuppey stuff- and my car had the EXACT same problem. we brought it back to the same place 2 more times, they tried new plugs, and went thru everything, said it was mechanically fine. brought it to a toyota guru friend, he said the same thing, then brought it to the toyota dealer, and they also said it was mechanically fine. there was nothing wrong with the car, but it kept missing, just like urs.

i dont know why i told the whole story, because we never were able to figure it out. we ended up sellign the car

[jaydog92ex]

idle problem

yep, i have replaced everything. and yes, i have tried some fuel injector cleaner with no luck. it also hasnt put out any codes. im just stumped.

[accordztech]

how is ur timming...how is ur cap and rotor...and ur plugs?

[ACCLUDE91]

jaydog
Other things that can cause what you're experiencing are:

1. faulty fuel injector(s)
2. MAP sesor error
3. Idle Air Control Valve incorrect
4. EGR system clogged or faulty
5. TDC/CKP/CYP sensors in distributor bad

Check those and get back to us.

[HondaFan81]

Originally posted by ACCLUDE91
jaydog
Other things that can cause what you're experiencing are:

1. faulty fuel injector(s)
2. MAP sesor error
3. Idle Air Control Valve incorrect
4. EGR system clogged or faulty
5. TDC/CKP/CYP sensors in distributor bad

Check those and get back to us.

On #5, check the wiring to these 3 sensors...make sure they are all connected properly (continuity check after wigglin them a bit) they'll lead into your distributor on 90-91..I think 92-93 might be different setup cuz of ext. ignition coil

[ACCLUDE91]

the plug for the TDC/CKP/CYP sensors is the same for all 90-93's. All wires are the same color and in same locations within the plug. Let me know if you need the testing procedures for anything.

[iamanonymous]

the plug for the TDC/CKP/CYP sensors is the same for all 90-93's. All wires are the same color and in same locations within the plug. Let me know if you need the testing procedures for anything.

OLD THREAD RESURRECTION!! haha
ok
97 accord se (lx-f22b2 external coil dizzy)
po6-uberdata
obd2-obd1 conversion
cel code 9
cyp sensor
wasn't throwing it before
no changes were made to the dizzy....
what is the pin (pins) on the po6 (any obd1) for the cyp sensor?
problem may lie in the conversion harness just looking for an answer so i can maybe resolder...

edit:
t3/t4 turbo
cel comes on shortly after starting the car

[Backfire32]

thats excatly what my car is doing right now to! i don't have a clue what it is , i was always thinking it was somtin to do with a fuel problem. but now that i read that i forgot that it could be causee of those other things! Now that i think about it i replaced the dizzy and its probably somtin wrong with that!

[WhiteGhost]

I know this is a old post sorry,but has anyone ever figured this problem out?Mine has done this forever, Just a quick miss at idle.....Nobody I know can explain it

[toycar]

I know this is a old post sorry,but has anyone ever figured this problem out?Mine has done this forever, Just a quick miss at idle.....Nobody I know can explain it

Way to bump a wicked old thread.



My guess on the topic;


Voltage issue. I would use a multi meter to monitor the voltage at the dizzy, and then work backwords from there.

There could also be a grounding issue. It depends. But using a multi meter I think you will find a varience in the voltage while the symptom is present.

Maybe your regulator on the alternator is causing the issue? Higher RPM is going to create more voltage. Lower RPM creates lower voltage. Maybe the voltage drops low enough to cause a missfire occasionally.

When voltage drops amperage spikes. So, with a multi meter you should be able to identify the issue.


I would use a multi meter and figure this out. Seems like a time consuming, simple fix. Identifying the problem seems to be the issue. I'd bet on being able to identify the issue through through voltage using a meter.

Also, get new spark plugs and monitor their condition. Maybe you could narrow down what cylinder is miss firing, and use that as a starting point for inspection. If its not consistently miss firing on the same cylinder, you can bank on the issue being related to the voltage supply or a grounding issue.


If its the same cylinder always, I would look harder at the ignition system and less at the power supply.


Good luck.

[WhiteGhost]

Crazy..You posted that because...I was really think'n a ground issue......or voltage issue also.....Crazy........I was 4sure thining the same......I really have reasons leading to a ground'n issue though......