Mr Anderson 1 Posted January 20, 2006 Report Share Posted January 20, 2006 Recently purchased another VR with a bit of an engine problem. Stupid thing to do really as I am crap with engines! There is a missfire in number 6 cylinder. Took it to a VW specialist garage and they said they didn't know what was wrong. They checked HT leads and compression and said they were not the cause but in could be an injector and advised me to take it to the VW dealership. Had a guy at the dealership look under the bonnet and the spark was jumping from number 6 lead so he advised me to get a new one and said injectors rarely go wrong. When I got home I swapped the lead from my other VR but still made no difference so I booked it in for an "investigation" at the dealership. They then told me that faults were showing on the plugs, leads and ignition coil which they quoted around £400 to put right and said that these faults could be hiding others??? Needless to say I told them where to go with their quote and found the parts needed for around £80 which a friend is coming to fit on Saturday. If the new parts fail to sort the problem I had planned to book it back in for another "investigation" at the dealership to see if they could figure it out after the parts had been fitted......not holding out much hope though to be honest So, does anyone on here have any idea what the problem could be??? The car is a 96 vr6 with 87k on the clock and a full servive history. Any help would be most appreciated!!!! Link to post Share on other sites
mightyvr6 0 Posted January 20, 2006 Report Share Posted January 20, 2006 Have you had the fault codes checked? Lots of things can cause misfires but changing the plugs and leads is a good start. Link to post Share on other sites
kilokilla 0 Posted January 20, 2006 Report Share Posted January 20, 2006 i was going to suggest coilpack you should find that will sort problem but let us know what happens when this has been done if its still not right after that it could well be an injector only takes a bit of crap to slip past fuel filter if filter not been changed for a while and it can block injectoror indeed if the filter is breaking down inside due to being old . Link to post Share on other sites
Eat this 2 Posted January 20, 2006 Report Share Posted January 20, 2006 could be a plug aswell Link to post Share on other sites
Mr Anderson 1 Posted January 20, 2006 Author Report Share Posted January 20, 2006 Thanks Lads. I will keep my fingers crossed that its just the plugs, leads and coil pack that need doing. I will keep you posted. Cheers Link to post Share on other sites
duncs 0 Posted January 20, 2006 Report Share Posted January 20, 2006 mine's just had the same problem. changed plugs and checked leads. no joy. had HT lead no. 3 replaced and no joy. then replaced coil pack, and all is now well.cost for changing coil pack and HT lead was £250 from main stealer.duncs Link to post Share on other sites
Seademon 0 Posted January 20, 2006 Report Share Posted January 20, 2006 The dealerships talking rubbish - no diagnostics pick up faults on plugs, leads and coilpacks! Could be a loose spark plug? I had a similar problem on mine for ages and it turned out to be that. See if can borrow a decent set of leads off someone and try those before buying a set yourself - the red OEM leads are around £110 a set. Link to post Share on other sites
Mr Anderson 1 Posted January 23, 2006 Author Report Share Posted January 23, 2006 Fitted new leads, plugs and tried 2 different coil packs and guess what.......? Thanks VW dealership, great advice. Still no difference. Anyone got any ideas what to do next?? Link to post Share on other sites
Buzzark 0 Posted January 23, 2006 Report Share Posted January 23, 2006 You need to find which cylinder is missing.Disconnecting the plug lead for each cylinder until you find the one that causes the least or no difference (will depend on the severity of the mis-fire in the 1st place).Be careful when doing so though and it's probably safer to your health to do it when the engine isn't running, shock from HT leads hurt and/or kill.You can try the same thing with the injectors too. If you're running a little bit rich, you may have one blocked injector. One cylinder doesn't fuel properly, so the ECU gets a lean signal from the lambda sensor and over fuels the other injectors. Again, if you've got a blocked injector, disconnecting the power to it won't make much difference to running. Link to post Share on other sites
Mr Anderson 1 Posted January 23, 2006 Author Report Share Posted January 23, 2006 Gave this a try earlier. I was originally told by the garage that number 6 cylinder was the one not working properly. When I removed lead 6 there was no change but strangely it was the same when i removed lead 5?? They were both still sparking though...odd...oh well...... Thanks for your help Link to post Share on other sites
Buzzark 0 Posted January 23, 2006 Report Share Posted January 23, 2006 That's interesting...Tried pulling them both?Shot in the dark, but it could be an inlet manifold leak and running lean on those end cylinders, or head gasket blown between the 2 of them?You could try some of that spray gas used for checking inlet leaks. A compression test should prove a non gasket issue, but some garages have weird ideas on how to test compression - eg, they'll test all cylinders at once (assuming there's no open valves at some point in the cycle). That's great, but if there's a blown gasket between 2 adjacent cylinders they keep each other pumped up.Single cylinder testing with open plug holes reveals more.Leads 5 and 6 aren't the wrong way round are they? !amazed Link to post Share on other sites
Mr Anderson 1 Posted January 23, 2006 Author Report Share Posted January 23, 2006 Blinding me with science a bit now but I will mention this to the next garage I take it to. Thanks a lot for your help and I will post up here when I find anything out. I will double check the leads but I am sure they were right Link to post Share on other sites
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