2001 "s" (uk car) missfire at idle?

[tommac]

Hi all,

Took car out for a run sunday all was fine, parked up for a while came back restrated fine had been sat about an hour so still warm ish- idle ok, driving fine, get into stop start traffic, and idle now iffy- is missig badly (sounds awful) blip it ok, turn ac off which helped, pulling away awkward untill it got to 1500 revs then fine, pulling like a train above this, all levels ok/temp etc. Im thinking coil packs? plugs? when it was serviced back in oct opc said it had a couple of cracked coil packs- what are your guys thoughts?

Thanks in advance!

PS car is a 2001. with 40k miles

[Loren]

:welcome:

Any fault codes?

If the coil packs were cracked in October - then they still are and should be replaced.

[tommac]

No fault codes - no light on the dash!

Yes the packs will need to be replaced- the opc said that they would need replacing when a problem occurs- unitl then not to worry?! Do you think the two could be related?

[Loren]

If you have misfires and no codes then the CEL bulb is likely burnt out (or has been removed).

If you have had any misfires then there would be at least pending codes.

[tommac]

sorry- my bad- what i ment was the light on the dash hasnt illuminated, not sure of there are codes as i do not have a reader!

[Richard Hamilton]

UK cars don't trigger the CEL for as many faults as US cars, so you are likely to have a code stored. If you are anywhere near me (Maidenhead, Berks) I'd be happy to help with a diagnostic check.

[tommac]

Thanks for the offer richard, unfortunatly im in devon- torquay! I do know a good indy down here so i will ask him if he can read the codes for me!? failing that it will be exeter opc!

[Richard Hamilton]

You could try Crispin Manners at Oak Tree Garage at Newton Poppleford. 01395-568498. Or maybe that's who you were thinking about.....

[Chris_in_NH]

Hi all,

Took car out for a run sunday all was fine, parked up for a while came back restrated fine had been sat about an hour so still warm ish- idle ok, driving fine, get into stop start traffic, and idle now iffy- is missig badly (sounds awful) blip it ok, turn ac off which helped, pulling away awkward untill it got to 1500 revs then fine, pulling like a train above this, all levels ok/temp etc. Im thinking coil packs? plugs? when it was serviced back in oct opc said it had a couple of cracked coil packs- what are your guys thoughts?

Thanks in advance!

PS car is a 2001. with 40k miles

sounds like it certainly could be coil packs. the fact that the car 'kicked back in' at 1500 rpms could be a symptom of bad coil packs. was it raining when this happened?

it could also be the MAF. an easy MAF test is to unplug the MAF's wiring harness (leaving the MAF in place) then disconnecting the neg battery cable for at least 1 minute (you will need your radio code), then reconnecting the battery (but not the MAF). see how your car behaves with the MAF unplugged. usually if the MAF *is* the problem, when you disconnect it (and then reset the DME by disconnecting the battery) the car will run perfectly. be advised, you may get a CEL with a P0102 code when the MAF is unplugged, which is normal and expected.

if your CEL hasn't lit up, then chances are you don't have any codes to read. if you think the CEL bulb might be burnt out, just turn the key to the first position to see if the CEL lights up during the bulb test.

i would give the MAF test a shot. you will know instantly if the MAF is the problem or not.

if it does turn out to be coil packs, i just replaced mine and can tell you it's very easy. here's the thread.

http://www.ppbb.com/boards/ppbbphp/showfla...;Number=1289587

warning: horrific pictures like this are included! these were mine at 11 years old! :o ;)

[tommac]

thanks for the replys guys- have ordereda new set of coils and plugs will be here tomo so will try and get them changed over the weekend!