Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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Recently when the car hasnt warmed up to 92oc yet
It doesnt seem to be very driveable, im not talking about "ragging" it before there are any wise cracks, im talking about just moving the car.
To descirbe it. when traveling at 30mph in say 3rd, the car will be fine then suddenly jerk like crazy. Almost like i am stamping on and off the accelreator 
This lasts untill it gets warm. I know first suggestion will be CTS but ive had 2 since january! Ive also had the wiring re-done so it cant be that as its basically brand new.
What else would cause this jolting/jerking? It surely cant be normal!
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mwg
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Registered: 19th Feb 04
Location: South Lakes
User status: Offline
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I've not had a LET Corsa but both the Corsas I've had have done this when they are cold. And both were fine once they had warmed up so I didn't do anything about it!
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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fuel problem?
air leak?
ignition system faulty?
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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surely tho, any of the above would still be showing symptoms when warm? as it litterally hits 92 and bang the car is like any other car to drive?
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Adam-D
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Registered: 11th May 02
Location: Cheshire
User status: Offline
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well an airleak can do it as when its cold its there when it warms up the metal expands a bit and seals it
ignition system coil pack and leads can run better hot than cold
fuel problem can sort itself when warm as its not getting the fuel it needs when cold but as it warms up it doesnt need the extra when cold so runs correctly
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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ok, take fuelling as an example, when you say theres a problem, what are the suspect parts? Pump/lines/tank
(bit of a novice sorry adam!)
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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no worries mate
bloked filter
partailly blocked injectors
faulty relay
faulty wiring to pump
pump not strong enuff or faulty
faulty fuel regulator
its all a process of elimiation 
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ed
Member
Registered: 10th Sep 03
User status: Offline
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It could be the ICV or the coolent temp sensor? Though, the ECU light would illuminate when the car judders if it was them...
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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Adam i dont think (correct me if im wrong) that my fuel pump would have been changed when i did the LETR conversion, would a 1.4 x14xe fuel pump be up to the job?
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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and ed im not getting any codes, and as mentioned hit 92oc eveything is fine...
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p16vlv
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Registered: 15th Jun 02
Location: rossendale
User status: Offline
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mine does exactly the same, when it starts jerking i just change up a gear .like you said its ok when warm. just something to put up with i suppose.
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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ive put up with it for a while, just pisses me off!  
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ed
Member
Registered: 10th Sep 03
User status: Offline
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quote:
Originally posted by Jambo
Adam i dont think (correct me if im wrong) that my fuel pump would have been changed when i did the LETR conversion, would a 1.4 x14xe fuel pump be up to the job?
The LET is MPI, your old 1.4 engine is MPI, they both run at the same fuel pressure. Unless the fuel pump is broken there should be no problem there...
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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Thank you ed,
Hmmm. Really wanting a re-manafactured engine.........
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X 60RSA
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Registered: 20th Aug 01
Location: Lincoln
User status: Offline
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Are you on a K&N? Then again i suppose there is no room for an airbox, i thought the colder air might be playing havoc, just a thought.
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ed
Member
Registered: 10th Sep 03
User status: Offline
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quote:
Originally posted by Jambo
Thank you ed,
Hmmm. Really wanting a re-manafactured engine.........
You will still be left with 10+ year old bits to put on it though
Speaking of warm air, It could be the AFM? Try swapping it over off of Steve's car, or if you are about next weekend and I am home then I'll bring mine over to have a looksie...
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Stu
Member
Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
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Does the LET run a cold MAP from the ECU? A lot of cars run the Lambda in a loop when the car is cold so they run like a bag of shit. When the car warms up the normal map kicks in along with the lambda sensor and all is well.
I would suspect your lambda sensor personally Jambo. It like when a car is having emission problems on its MOT, let it get red hot then do it and you usually find it passes cos it burns the fuel better.
Stu 
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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If by lambda u mean o2 sensor then this was replaced month before last, plus when it went it was giving me an EML so dont think it would be that makes sense tho!
Ed im working this weekend
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ed
Member
Registered: 10th Sep 03
User status: Offline
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Has it always done this or has it only just started after we fixed it 
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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Always ed
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and-m
Member
Registered: 5th May 02
Location: Liverpool. Drives. Skud vRS.
User status: Offline
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quote:
Originally posted by ed
quote:
Originally posted by Jambo
Adam i dont think (correct me if im wrong) that my fuel pump would have been changed when i did the LETR conversion, would a 1.4 x14xe fuel pump be up to the job?
The LET is MPI, your old 1.4 engine is MPI, they both run at the same fuel pressure. Unless the fuel pump is broken there should be no problem there...
Untrue, LETs require more fuel pressure and the AFMs between XEs and LETs are completely different.
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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soooooooooooooooooo...
do i need something uprating?
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Greasemonkey
Member
Registered: 17th Apr 02
Location: Drives a Tractor
User status: Offline
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AFM i suspect or check the gapping of ya plugs this is very important on a blown motor
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ed
Member
Registered: 10th Sep 03
User status: Offline
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quote:
Originally posted by and-m
quote:
Originally posted by ed
quote:
Originally posted by Jambo
Adam i dont think (correct me if im wrong) that my fuel pump would have been changed when i did the LETR conversion, would a 1.4 x14xe fuel pump be up to the job?
The LET is MPI, your old 1.4 engine is MPI, they both run at the same fuel pressure. Unless the fuel pump is broken there should be no problem there...
Untrue, LETs require more fuel pressure and the AFMs between XEs and LETs are completely different.
Surely it's the fuel pressure regulator the creates the extra pressure though?
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langey
Member
Registered: 7th Sep 03
Location: Wigan
User status: Offline
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i have the same problem as you jambo, just thought its coz its cold, once it lights up the 1st 2bars on the digidash it runs good and wants to be booted.
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