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Jolting understrain or heavy acceleration

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Oct 28, 2015, 8:56 AM

Post #1 of 3 (713 views)
Jolting understrain or heavy acceleration Sign In

Year of vehicle: 2010
Make of vehicle: Vauxhall
Model of vehicle: Astra J Shape
Engine size: 1.4
Mileage/Kilometers: 78,000

Hey All,
My car begins to jolt as if its miss firing when the engine is under strain such as going uphill or when heavy accelerating. It also seems to only happen once the car has been running for a while and warmed up?
I had this problem at the start of the year however it happened more often and actually stopped the car at one point giving an engine error showing a miss fire. I the car the garage and had it fully serviced and since then it had been fine. However it recently started to happen again. When it went to the garage they highlighted that the Coil Pack connector to the engine was broken, it still connected but the cover around it snapped meaning the connection could loosen. I have checked the connection it still seems to be connected not loose. The car drives fine until I push on the acceleration beyond 3250rpm.

Also if the car is still and engine is just ticking over I can feel the engine jolt a couple of times in a row every few minutes.

Can anyone point me in the right direction or suggest any tests I can perform to narrow down the problem?

I appreciate any input anyone can provide.

Kindest Regards


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 28, 2015, 9:21 AM

Post #2 of 3 (709 views)
Re: Jolting understrain or heavy acceleration Sign In

Ben - Welcome. Know that we don't have this car in the US so limited for specifics.
Real basic on this. You took it to a garage (shop) for this and they found something. You may have only seen a cover to it not the whole show. I sure can't compete with a technician who pointed something out that sure could cause this. Maybe it does feel plugged in OK and can't be removed again now if ever needed so I'd heed their suggestion that, that part is broken and should be fixed. If that doesn't solve it then go for the hunt on what is,


kev2 profile image

Oct 28, 2015, 10:21 AM

Post #3 of 3 (701 views)
Re: Jolting understrain or heavy acceleration Sign In

as my colleague pointed out - not sold here. BUT it is a GM product so we can give some basic direction.
holding back @ 3250rpm... might want to look at fuel pressure....
I do not rev (Rpm) that high VERY often. slow DOWN :)

scan for codes - yes even if the engine management light is off. AKA ck eng light.
Did you modify or use any parts components that were not GM (vauxhall) ?
The connector if bad are often available separate as replacements see dealer.

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