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Author Yet more LET problems (cold)
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 08:32   View User's Profile U2U Member Reply With Quote

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!



mwg
Member

Registered: 19th Feb 04
Location: South Lakes
User status: Offline
3rd Oct 05 at 08:39   View User's Profile U2U Member Reply With Quote

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!
Adam-D
Member

Registered: 11th May 02
Location: Cheshire
User status: Offline
3rd Oct 05 at 09:04   View User's Profile U2U Member Reply With Quote

fuel problem?
air leak?
ignition system faulty?
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 09:05   View User's Profile U2U Member Reply With Quote

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?
Adam-D
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Registered: 11th May 02
Location: Cheshire
User status: Offline
3rd Oct 05 at 09:19   View User's Profile U2U Member Reply With Quote

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
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 09:20   View User's Profile U2U Member Reply With Quote

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!)
Adam-D
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Registered: 11th May 02
Location: Cheshire
User status: Offline
3rd Oct 05 at 09:22   View User's Profile U2U Member Reply With Quote

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
ed
Member

Registered: 10th Sep 03
User status: Offline
3rd Oct 05 at 09:27   View User's Profile U2U Member Reply With Quote

It could be the ICV or the coolent temp sensor? Though, the ECU light would illuminate when the car judders if it was them...
Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 09:35   View User's Profile U2U Member Reply With Quote

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?
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 09:36   View User's Profile U2U Member Reply With Quote

and ed im not getting any codes, and as mentioned hit 92oc eveything is fine...
p16vlv
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Registered: 15th Jun 02
Location: rossendale
User status: Offline
3rd Oct 05 at 10:53   View User's Profile U2U Member Reply With Quote

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.
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 11:49   View User's Profile U2U Member Reply With Quote

ive put up with it for a while, just pisses me off!
ed
Member

Registered: 10th Sep 03
User status: Offline
3rd Oct 05 at 11:58   View User's Profile U2U Member Reply With Quote

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...
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 12:14   View User's Profile U2U Member Reply With Quote

Thank you ed,

Hmmm. Really wanting a re-manafactured engine.........
X 60RSA
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Registered: 20th Aug 01
Location: Lincoln
User status: Offline
3rd Oct 05 at 12:31   View User's Profile U2U Member Reply With Quote

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.
ed
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Registered: 10th Sep 03
User status: Offline
3rd Oct 05 at 13:08   View User's Profile U2U Member Reply With Quote

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...
Stu
Member

Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
3rd Oct 05 at 14:40   View User's Profile U2U Member Reply With Quote

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
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 14:52   View User's Profile U2U Member Reply With Quote

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
ed
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Registered: 10th Sep 03
User status: Offline
3rd Oct 05 at 15:01   View User's Profile U2U Member Reply With Quote

Has it always done this or has it only just started after we fixed it
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 15:12   View User's Profile U2U Member Reply With Quote

Always ed
and-m
Member

Registered: 5th May 02
Location: Liverpool. Drives. Skud vRS.
User status: Offline
3rd Oct 05 at 15:25   View User's Profile U2U Member Reply With Quote

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.
Jambo
Member

Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
3rd Oct 05 at 15:28   View User's Profile U2U Member Reply With Quote

soooooooooooooooooo...



do i need something uprating?
Greasemonkey
Member

Registered: 17th Apr 02
Location: Drives a Tractor
User status: Offline
3rd Oct 05 at 15:35   View User's Profile U2U Member Reply With Quote

AFM i suspect or check the gapping of ya plugs this is very important on a blown motor
ed
Member

Registered: 10th Sep 03
User status: Offline
3rd Oct 05 at 15:44   View User's Profile U2U Member Reply With Quote

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?
langey
Member

Registered: 7th Sep 03
Location: Wigan
User status: Offline
3rd Oct 05 at 17:09   View User's Profile U2U Member Reply With Quote

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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