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Author Topic: Lack of throttle response  (Read 2086 times)

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peter e

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Lack of throttle response
« on: 10 May 2008, 12:28:16 »
I have a problem with my Omega 2.2DTI Estate Year 2000. The car will at times run fine, and other times there is a real lack of throttle response, and the engine management light will light up now and then for a short period.
      
      I have plugged in an elm327-usb the software is scantool version 1.13, it is showing throttle pedal response etc which seems fine, but there are no error codes showing. Ive been told that if the engine management lights for less than thirty seconds it will not store the error codes. I am thinking of looking around the air intake and vac lines to see if anything obvious is wrong. But if somebody could please advise and point me in the right direction, it would be very much appreciated. Thank you.
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Dazzler

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Re: Lack of throttle response
« Reply #1 on: 10 May 2008, 12:37:30 »
When did it last have all its filters and oil replaced??
Make sure all the clips are done up on the turbo pipes and intercooler air pipes etc....
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Big_Mart

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Re: Lack of throttle response
« Reply #2 on: 10 May 2008, 12:46:13 »
If its on for a brief time and thats when the fault occurs would recommend MAF sensor, if its affecting throttle response/performance??
The only other thing they really suffer from is clogged EGR valves and clogged inlets, but to confirm you will really need a fault code or a live snap shot of when the fault occurs to see whats going on. :y
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peter e

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Re: Lack of throttle response
« Reply #3 on: 10 May 2008, 12:47:21 »
resently got the car and its supposed to have been serviced, but I will check what you have suggested. Thanks
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peter e

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Re: Lack of throttle response
« Reply #4 on: 10 May 2008, 13:14:50 »
The engine management light will light up for a short time now and then, but the trottle resonse can be for along preiod. I will see if I can catch it while hooked up to the laptop, but even if I dont catch it its a good suggestion and worth looking into. If nothing else I have now several good excuses for getting out of going shopping this weekend. Thanks
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Dazzler

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Re: Lack of throttle response
« Reply #5 on: 10 May 2008, 15:35:10 »
Didn't know diesels had an EGR valve :-/
You live and learn i supposse.
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Andy B

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Re: Lack of throttle response
« Reply #6 on: 10 May 2008, 15:47:04 »
Quote
If its on for a brief time and thats when the fault occurs would recommend MAF sensor, if its affecting throttle response/performance??
The only other thing they really suffer from is clogged EGR valves and clogged inlets, but to confirm you will really need a fault code or a live snap shot of when the fault occurs to see whats going on. :y

My 1.7 low blow turbo diesel Astra did this & the cure was a MAF.
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MickAP

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Re: Lack of throttle response
« Reply #7 on: 10 May 2008, 15:51:34 »
My diesel has just started to behave like this 2.5TD.
Only seems to be when fully up to operating temp, I use it mostly during the week for short journeys so barely gets up to proper temp.
Seems like lack of throttle reponse (sluggish) then kicks in when floored, then all seems ok again. I had it serviced just 10 days ago and I asked them to change the diesel fuel filter, was wondering if maybe something to do with fuel supply.
No  EML showing up on mine though.

Mick
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Dazzler

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Re: Lack of throttle response
« Reply #8 on: 10 May 2008, 16:36:58 »
Could be the low pressure pump in the boot, this has been on here a few times normally worse with less than a 1/4 tank of fuel.
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RichardH

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Re: Lack of throttle response
« Reply #9 on: 10 May 2008, 19:36:06 »
I have similiar problems with my 2.2 DTI saloon.  Throttle response seems to be very sluggish most times.  The car itself feels underpowered when you try and accelerate hard.  I also have the engine management light come on every now and again.  It seems to come on usually when I am climbing a long hill for example in fifth gear.  No fault codes stored either which does not help.
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MickAP

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Re: Lack of throttle response
« Reply #10 on: 11 May 2008, 09:11:37 »
Seems like 3 of us with the same problems, I'm going to try a dose of injector cleaner as a first fix. What's recommended usually have used Redex.

Mick
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RichardH

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Re: Lack of throttle response
« Reply #11 on: 11 May 2008, 10:54:34 »
I have not had a chance to really start fixing mine but I am going to have a more serious look at it over the coming weeks.  Gonna start with all the filters and move on to the MAF sensor i think and see how it goes.
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peter e

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Re: Lack of throttle response
« Reply #12 on: 13 May 2008, 10:25:10 »
I have cleaned the EGR valve, it was a bit dirty (does any one know when the vac should be on to that valve). changed the air filter, looked for any obvious vac line leaks etc, but it is still not any better.
While waiting for the fuel filter to arrive. I thought I would check the suggestion about the low pressure fuel pump may be at fault, I can not hear it running so I thought I would check the fuse (according to handbook No18), no fuse and there no wires to fuse No18 ? does any body know which fuse it could be, or which coloured wires are for the pump at the tank end. I could then check for power etc.
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peter e

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Re: Lack of throttle response
« Reply #13 on: 14 May 2008, 15:04:33 »
To cut a long story short, Yesterday I took off fuel flow/return pipe and elec assembly from fuel tank, found that there is no fuel pump. Assume pump in tank is for the petrol versions? traced pipework to engine bay as best as I could and cannot find a low pressure pump (this would explain no fuse 18). Fuel filter arrived and fitted it.
Going home approx 18 miles the car ran well not at all sluggish all the way, but approx half hour later went into town and the car went back to being sluggish again. This morning went to work and the car is running fine again. The EML has not lit since friday, not sure if this is good or not. Any ideas ??
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Marks DTM Calib

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Re: Lack of throttle response
« Reply #14 on: 14 May 2008, 15:21:26 »
Here is an extract from a technical bulletin to consider:

Diesel engines - Lack of power, jerking

Complaint: Lack of power, jerking

Cause: Air flow meter gets dirty or damaged because of water and oil, which drains through air inlet, air cleaner.

Production: Modified air mass meters have been introduced as of following VIN: Corsa C: Zaragoza: 08.05.01 W0L0XCF0814245493, Eisenach: 03.05.01 W0L0XCF6816105048, Azambuja: 25.05.01 W0L0XCF0813037404 Astra G: Bochum: 27.04.01 W0L0TGF3512245739, Antwerp:26.04.01 W0L0TGF4815248465, E'Port: 27.04.01 W0L0TGF3518127674 Zafira: Bochum: 06.04.01 W0L0TGF7512227609 Vectra B: Rüsselsheim: 27.04.01 W0L0JBF3511132832, Luton: 04.05.01 W0L0JBF6817066219 Omega B: Rüsselsheim: 04.05.01. W0L0VBP6911123565 Frontera B: Luton: W0L06BG761V500551 All hot film mass air flow meters with a stamp 183 (= March 2001) or lower have to be replaced.

Remedy

In case of customer complaint replace hot film mass air flow meter which has a stamp 183 (= March 2001) or lower.

Check the stamp on the right side of the connector socket of hot film mass air flow meter.

The first three digits of the stamp are describing month and year
of production, e. g. 088

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