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Shudder on acceleration

9

911KSM

Monza
Joined
10 May 2013
Messages
203
Just took the 4S out for the first time in a couple of weeks. Got in and the fuel light was on. Drove 1 mile to the nearest petrol station at a steady speed and put in £50 of BP Ron 97. Everything seemed normal.

Drove out of the petrol station and on accelerating the car hesitates and shudders. Drove a couple of miles and problem persisted and then the amber engine management light came on and stayed on for 20 secs or so then went off.

Drove another couple of miles to get home and the problem continued but did seem to ease a bit.

Has anyone has a similar issue, I am thinking maybe a fuel block or maybe something more sinister?

Any ideas appreciated.

Kevin.
 
Damp coil pack.
 
So if it is a damp coil pack is there anyway of drying it out. Would a good run help?
 
Yes, I would've thought so. Worth having a £10 code reader so when things like this happen, you can have a look what the fault is.

Also, was the car left outside for 2 weeks or in a dry area? Moisture is always a killer with cars, but the coil packs get quite warm on a run and should hopefully dry out any unwanted water.
 
I had a similar issue when I put standard fuel in. Next time I filled up with Shell Nitro and all was good again.
 
My money is on coil packs too - If the damp has got in, its because the casing on one of them has deteriorated and cracked and is letting the moisture in - so it will need replacing - best replace all 6 if they haven't been done recently, I view them as a 5 yearly service item!
 
he put 97 in, his point was its BP, not Shell......

Coil packs, get them replaced, if they fail properly the car will splutter and be completely undriveable.
 
Coil pack!

Got 9 years/40k miles before they needed replacing (after a carwash), one was falling apart, two were split, one was starting to split, and two looked like new. Obviously I just had all six replaced. Fortunately spark plugs were a bit overdue to be changed, so killed two birds with one stone!
 
Poker2009 said:
Coil pack!

Got 9 years/40k miles before they needed replacing (after a carwash), one was falling apart, two were split, one was starting to split, and two looked like new. Obviously I just had all six replaced. Fortunately spark plugs were a bit overdue to be changed, so killed two birds with one stone!
Click to expand...

I have just replaced my plugs and coil packs in readiness for the arrival of my Kline Exhaust on Friday. How much was the bill for your work as it would be interesting to know how much cash my skinned knuckles and sleepless nights have saved me :?: :floor:

In fairness, it's been an enjoyable project (I will cover it in a separate thread in the New Year) and I have learned plenty about my car and how it's screwed together. The original fixings used [mostly] were crap so these have been swapped out with S/S, copper flashed or titanium.

I am not sure if the OP's problem is fuel related or ignition but I can say that I once had very poor running in my old Tuscan when I filled up with cheap fuel at a Jet garage whilst touring round the SW of England. It was a case of needs must but I now ensure that my weekend cars get quality fuel but there may be bad batches out there that may cause problems for our needy cars? I would have thought that coil pack issues would have been apparent on the way to the garage and not just once the new fuel was added?
 
Well I got a little ripped off (imo) and paid £445 in 2013, but I think it should could cost around £350.
 
Scholester said:
I would have thought that coil pack issues would have been apparent on the way to the garage and not just once the new fuel was added?
Click to expand...

This was my thought exactly. No issues mentioned on way to garage but immediately after filling up with fuel. Maybe just a bad batch of fuel.
 
thanks for the responses so far. I checked my receipt from the garage and i definately put in ultimate unleaded 97 from the BP station. I only put in 37 litres so maybe i'll top it up with Shell.

My car is a 2008 31k with FPSH so maybe the coils. I plan to give the car a run tomorrow and see if there is any difference.

Just had the starter motor and battery replace at OPC and only done 60 miles since so looking like an expensive month.

Does anyone use a reputable specialist in Essex as I have always used my OPC before.

Kevin.
 
911KSM said:
thanks for the responses so far. I checked my receipt from the garage and i definately put in ultimate unleaded 97 from the BP station. I only put in 37 litres so maybe i'll top it up with Shell.

My car is a 2008 31k with FPSH so maybe the coils. I plan to give the car a run tomorrow and see if there is any difference.

Just had the starter motor and battery replace at OPC and only done 60 miles since so looking like an expensive month.

Does anyone use a reputable specialist in Essex as I have always used my OPC before.

Kevin.
Click to expand...
Like you say Kevin, top it up with Shell V, take it for a good run and hopefully it will sort itself.
Others in the Essex area will be along with their recommendations for a good local Indy should your problems continue but you are going to need one for your servicing work anyway.
Good luck and keep us posted.
 
When did you last have a major service with spark plugs,at OPC? They always check coil packs at that point and advise replacement if required.

It does sound like a coil.pack issue.
 
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