NEILX5 0 Posted November 16, 2007 Report Share Posted November 16, 2007 Hi again. i OWN A 97 VR6, pulling from stand still, the car will judder and even backfire somtimes until the revs get higher. the car does not seem like the monster it once was. In the warmer weather i thought the problem was cured. Any ideas.Thanks Link to post Share on other sites
rodney 17 Posted November 16, 2007 Report Share Posted November 16, 2007 Well there are the ususal things to check.... Does it only happen under load or when you rev it??? I ask so you can pop out a plug or a lead and see what effect is has when testing!!!!!!!Are all the contacts clean and where applicable gapped correctly? (Spark Plugs/throttle boddies/MAF etc etc etc etc)Are all HT aspects ok? Coil pack and cables????Is the Alternator working correctly?????Is the battery good?????Are the ECU contacts etc all clean and not wet etc etc etc Do you have any fault codes such as Lamba sensor??????After that we will need to look a little deeper..... such as moisture in the fuel lines (perished pipes) etc etc etc things where the heat starts to evaporate or expand metal parts that will create the issue when cold....Old fashioned chokes/condensors/carbs - balancing and points are always the place to start..I assume the car is standard and there are no issues with the timing/head gasket etc etc etc etcLet us all know and we can start the old grey matter in to deeper thoughtgood luck!!!! Link to post Share on other sites
amazak 3 Posted November 16, 2007 Report Share Posted November 16, 2007 Well there are the ususal things to check.... Does it only happen under load or when you rev it??? I ask so you can pop out a plug or a lead and see what effect is has when testing!!!!!!!Are all the contacts clean and where applicable gapped correctly? (Spark Plugs/throttle boddies/MAF etc etc etc etc)Are all HT aspects ok? Coil pack and cables????Is the Alternator working correctly?????Is the battery good?????Are the ECU contacts etc all clean and not wet etc etc etc Do you have any fault codes such as Lamba sensor??????After that we will need to look a little deeper..... such as moisture in the fuel lines (perished pipes) etc etc etc things where the heat starts to evaporate or expand metal parts that will create the issue when cold....Old fashioned chokes/condensors/carbs - balancing and points are always the place to start..I assume the car is standard and there are no issues with the timing/head gasket etc etc etc etcLet us all know and we can start the old grey matter in to deeper thoughtgood luck!!!!RCF, out of curiosity how would the alternator and battery cause this issue? I have a similair problem so going to change HT leads tomrrow and see what gives.......... Link to post Share on other sites
adam_christie 0 Posted November 17, 2007 Report Share Posted November 17, 2007 Well there are the ususal things to check.... Does it only happen under load or when you rev it??? I ask so you can pop out a plug or a lead and see what effect is has when testing!!!!!!!Are all the contacts clean and where applicable gapped correctly? (Spark Plugs/throttle boddies/MAF etc etc etc etc)Are all HT aspects ok? Coil pack and cables????Is the Alternator working correctly?????Is the battery good?????Are the ECU contacts etc all clean and not wet etc etc etc Do you have any fault codes such as Lamba sensor??????After that we will need to look a little deeper..... such as moisture in the fuel lines (perished pipes) etc etc etc things where the heat starts to evaporate or expand metal parts that will create the issue when cold....Old fashioned chokes/condensors/carbs - balancing and points are always the place to start..I assume the car is standard and there are no issues with the timing/head gasket etc etc etc etcLet us all know and we can start the old grey matter in to deeper thoughtgood luck!!!!RCF' date=' out of curiosity how would the alternator and battery cause this issue? I have a similair problem so going to change HT leads tomrrow and see what gives..........[/quote']To be honest mate, the symptoms are pretty generic. If an earth connection between an engine and chassis rotted away or disconnected, and the owner of that car came on here and said "may car's running lumpy, it mis-fires, etc etc", I'm sure RCF's first questions (and mine) would be "How's the battery? Is the alternator charging properly? Are the leads OK?"Reason being: Spark is probably the most important thing in a combustion engine. If it's not one, it's usually one of the others. Link to post Share on other sites
amazak 3 Posted November 17, 2007 Report Share Posted November 17, 2007 Thanks for making that clear, I was wondering how the battery and alternator could cause that issue. Link to post Share on other sites
rodney 17 Posted November 18, 2007 Report Share Posted November 18, 2007 What he said..... Sorry should have been a bit clearer..... & Thanks ...Let us know how it goes...Hope that helps.. Link to post Share on other sites
amazak 3 Posted November 19, 2007 Report Share Posted November 19, 2007 Guy's,Fitted new leads yesterday and the problem is now resolved.Yipee!Thanks for the help! Link to post Share on other sites
james4287 1 Posted December 15, 2007 Report Share Posted December 15, 2007 so it was just leads yeah? and that meant you only had problems when cold? Link to post Share on other sites
Recommended Posts