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lumpy idle when warm 

 

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 Post subject: lumpy idle when warm
Posted: Fri Feb 15, 2008 8:09 pm 
Tyre Shredder
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i have a strange one here guys n gals:

when i start the car 1st thing in the morning (cold) its fine. but when it warms up it idles really rough, like its misfiring.

any ideas guys??? i've checked plugs and leads.

 

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Posted: Fri Feb 15, 2008 8:32 pm 
Getting Side Ways
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The ISC may be buggered, Try tightening up the 2 bolts.....Or the ISC gasket may be buggered.

 

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Posted: Fri Feb 15, 2008 8:43 pm 
Tyre Shredder
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will have a look tomorrow, i'll let you know how it goes.

also the car has stalled on me before at lights. and sometimes when i brake it feels like the ISC is fighting against the brakes. i guess its preventing stalling?

 

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Posted: Sat Feb 16, 2008 4:00 pm 
Tyre Shredder
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the isc appears to be fine... gave it a clean. the gasket is intact and the bolts were tight as sh*t.

still doin the same crap, and sometimes it's hard to start when it's warm.

 

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Stock EL Gli Sedan, Tickford 98 EL/AU Hybrid Swapped in after aux shaft failure due to a lazy mechanic who can't service cars and aftermarket distributor-of-death-made-in-china crap.
Soon to be: The FalcMont - Build thread: viewtopic.php?f=53&t=120773

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Posted: Sat Feb 16, 2008 4:08 pm 
Getting Side Ways
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yeah i think it could well be ur intake sensor cause my xr is doing the same thing as what urs is doing.
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Posted: Sat Feb 16, 2008 7:52 pm 
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where is the air intake sensor so i can check it, also what are the resistance values for it in ohms???? (yes i know i need a service manual)

 

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Stock EL Gli Sedan, Tickford 98 EL/AU Hybrid Swapped in after aux shaft failure due to a lazy mechanic who can't service cars and aftermarket distributor-of-death-made-in-china crap.
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Posted: Sat Feb 16, 2008 11:41 pm 
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give the throttle body a clean out. it fills up with crap from the positive crank vent sys

 

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Posted: Sat Feb 16, 2008 11:45 pm 
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my car has got the exact opposite problem.

it misfires bad and runs like a pig for the first few minutes of a stone cold start, then will run fine for the rest of the day
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Posted: Sat Feb 16, 2008 11:49 pm 
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FordFairmont wrote:
my car has got the exact opposite problem.

it misfires bad and runs like a pig for the first few minutes of a stone cold start, then will run fine for the rest of the day


same

 

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Posted: Sun Feb 17, 2008 11:44 am 
Tyre Shredder
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is there a technical doc on cleaning the throttle body??

if not can someone guide me through the process.

i know..... GET A SERVICE MANUAL!!!

its on my to do list

 

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Posted: Sun Feb 17, 2008 12:07 pm 
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grab a can of crc / carby cleaner etc and spray along the gasket where the intake manifold joins to the head, while its running, if it smooths out, you have a leak on that gasket.
You could also have an ignition issue, dribbling injector, or sensor problem. you just need to isolate one at a time
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Posted: Sun Feb 17, 2008 4:00 pm 
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whats the best way to check for an ignition issue or dribbling injectors??

 

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Stock EL Gli Sedan, Tickford 98 EL/AU Hybrid Swapped in after aux shaft failure due to a lazy mechanic who can't service cars and aftermarket distributor-of-death-made-in-china crap.
Soon to be: The FalcMont - Build thread: viewtopic.php?f=53&t=120773

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Posted: Sun Feb 17, 2008 4:11 pm 
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I have the exact same problem and all of the above suggestions dont work. Im putting it down to a sticky fuel reg as it appears to be fuel related and its about the only thing that hasnt been changed!

Ive changed fuel filter, injectors, plugs, leads, dizzy cap, rotor button, iat and oxy sensor, fuel pump (old one failed) Tried different isc, map sensor, tps and have put in a better ecu. Its not a vacuum leak on the intake nor is the cat blocked.
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Posted: Sun Feb 17, 2008 5:18 pm 
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joolz wrote:
I have the exact same problem and all of the above suggestions dont work. Im putting it down to a sticky fuel reg as it appears to be fuel related and its about the only thing that hasnt been changed!

Ive changed fuel filter, injectors, plugs, leads, dizzy cap, rotor button, iat and oxy sensor, fuel pump (old one failed) Tried different isc, map sensor, tps and have put in a better ecu. Its not a vacuum leak on the intake nor is the cat blocked.


so where's the fuel regulator??

something interesting happened last night too:

cold start, drove 5km, left the car for about 10 mins.
started it again and without me doing anything and aircon off, the engine revved itself to 1k and sat at 1k for about 30 seconds then it idled correctly.

seems strange to me

 

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Stock EL Gli Sedan, Tickford 98 EL/AU Hybrid Swapped in after aux shaft failure due to a lazy mechanic who can't service cars and aftermarket distributor-of-death-made-in-china crap.
Soon to be: The FalcMont - Build thread: viewtopic.php?f=53&t=120773

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Posted: Sun Feb 17, 2008 10:40 pm 
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Its on the rear of the injector rail. As far as i know it controls the amount of fuel pumped through the injector depending on the pressure in the fuel rail. I guess if the reg is stuck shut it could actually pump in too much fuel or if its open too much not allow enough for when you put the foot down. Either of these IMo could cause poor idle and performance. I have noticed mine idles rough in cycles when hot. Like the fuel pressure is up and down.
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