Vauxhall Astra delayed response from accelerator

Car: Vauxhall Astra
Variant: sxi 115 bhp
Model Year: 2007
Categories: Running Rough, Starting & Power Loss
Help,
I have the following problem with my Astra - just done 9000 miles. Have taken it to a Vauxhall dealer, but since no problems showed up on 'Tech 2' they refused to investigate it any further. In fact they were not exactaly helpful. Don't know what to do next. (Had an Astra before 8v version and ran it for 7 years & 106,000 miles with no problems - except the common EGR fault)

Symptoms on 'new' car are as follows:

1) Delayed response from accelerator (both when applying and removing gas)
2) Holding back on acceleration.
3) Hesitation on acceleration (especially at higher speeds).
3) Delayed response when easing off on acceleration. I.e. Take foot off gas, depress clutch – revs do not immediately reduce – increases for approximately second (or slightly less) before falling off;
4) High fuel consumption.
5) The problem appears worse when the lights are on (E.g. headlights, sidelights).
6) Juddering when starting off at low/medium revs. Need high revs;
7) Faults more apparent if
a) Starting off uphill when the engine is warm.
b) Slowing down whilst travelling uphill as if coming to a stop (but not stopping), then select first gear to pull away (as if coming to a give way junction) and attempt to continue. The car will judder since although the accelerator is depressed, the engine will still be idling.
c) Accelerating at speed (E.g. on the motorway); depress the accelerator, the speed will actually reduce briefly before accelerating.

After a period of non use then the car drives OK. Problems appear to start after acceleration has been applied a few times. Generally however, the engine must be warm or hot for the faults to become apparent; when cold and first started up then drives perfectly.

Any help, or suggestions of where I could take it (or how to get Vauxhall to investigae further) and at least get the fault identified would be helpful (Gtr Manchester area). I suspect an injector or stepper motor fault.
Posted: Mar 27, 2008 (16 years ago)
the problem that you are having sounds like the throttle/accelerator pedal is faulty as these are fly by wire meaning electronic no cable is involved have this inspected and i think you will find its at fault hope this helps this is going by the answers you gave
Posted Mar 27, 2008 (16 years ago)
Thanks thomkas_cars for your response . I have already considered the foot pedal fault but discounted it, since the speed drops when depressing it at speed (E.g. on Motorway).

The car is still under manufacturer's warranty, so how do I get a Vauxhall dealer to do something without them giving me the run around?

I suspect an injection fault. The reason for this is as follows:
About 12 to 13 years ago, just when injection had just become standard, I had a similar fault (but not as bad) on a 1.4 Astra that had done 30K. I took it to a Vauxhall dealer but no fault found. There was no fault codes stored in the ECU. Then several montrhs later whilst they were servicing it they found the problem - an injector. It was fixed and I kept the vehicle was billiant and I eventually replaced it at 90,000 miles.

So my question again is (bearing in mind the vehicle is under manufacturer's warranty), how do I get a Vauxhall dealer to diagnose and fix the fault? (I appreciate that if an injector fault does not show up on the ECU, then it is likely to be time consuming in finding and replacing it).

Again, thanks for your help. Any further suggestions from yourself or other members would be appreciated.
Posted Mar 27, 2008 (16 years ago)
Hi Can anyone help.

My girlfriend has a 1.4 astra on 99 plate.

It runs great when going over 40 mph but anything under or if you decrease excelleration the car starts ' Kangaroo Jumping '.
Engine management light comes on and car drives fine???

Using a lot of petrol, had it on several computers but not giving any answers.

Anyone got any ideas
Cheers
Posted Jun 13, 2008 (16 years ago)

This problem is archived

If you're having a similar problem please click below to re-post this problem, you can then customise it to suit your situation.

Join the community
Got a question? Can you answer other questions here? If so please...
More problems with the 2007 model year Vauxhall Astra

We have 95 problems and solutions in our database for this model year of the car.

View all Vauxhall Astra Problems