After starting my car for the first time in three weeks to bring it out the garage after fixing my last misfire I noticed yet again it's running on 5.

 

I pulled each coil feed and located the one that didn't change engine note, I swapped two coil packs over to see if the mis moved cylinder, it didn't, so I swapped the spark plugs, the mis didn't move, I checked the voltage at the coil feed and it's live...

 

What should I be checking next?

 

Thanks, Dan

first point of call would be connectors on PTU & CAS... then injectors, coils, maf... ect..

Would a fault on maf, ptu and cas connector cause just one cylinder to fail? Thanks

Would a fault on maf' date=' ptu and cas connector cause just one cylinder to fail? Thanks[/quote']

 

I traced my dead cylinder back to corrosion on the ptu. It was so bad that I had to remove about 5" of the loom and resolder a new plug on to it.

Would a fault on maf, ptu and cas connector cause just one cylinder to fail? Thanks

 

As steams says, yes the ptu sends signals to different coils... but cleaning the connectors will ensure that they aren't the issue and is good practice.

Put money on it been the injector connection at best or dead injector at worse, leave a coil pack plugged in but out of the cylinder with a spark plug in it and close to the engine to see if you have spark and if so go to the injector connection, most likely will be green and nasty, if you have a test meter see what resistance it is, should be around 13ohms.

 

Jeff TT

Edited October 8, 201312 yr by JeffTT

Thanks lads, my injector has tested at almost 1500, the one next to it was 13, looks like the plenum is coming back off...

Thanks lads, my injector has tested at almost 1500, the one next to it was 13, looks like the plenum is coming back off...

 

 

No need just dremel the bit of the plenum that is in the way, honestly 15 to 20 minutes and saves you ages and a plenum gasket, have done a few write ups with pictures.

 

Jeff TT

Any idea what would cause two injectors now to go down within a few weeks of one another??

 

I have now removed my bee r rev limiter as a precaution!??

 

Many thanks

Just tested the resistance again, this time it's just over 300 compared to yesterday's 1500!??

i just had this fault tuned out to be a knackered plug on an injector

Is it clean? 300 or 1500 it's still wayyyy out should be about 13 ohms

When you say clean, are you meaning the terminals on the actual injector where I'm testing?

Sorted!

 

two screws holding the injector down, one comes out real easy, the second one ideally needed the plenum off so I hit it round with a hammer and screw driver and carefully wound it out with some pliers, I did have to grind some of the plenum back with a dremmel. I homed the new injector by carefully knocking it down with the clamp in place. Unfortunatley I couldnt get the "awkward to get to" screw back in, so for now its only held in with one...

 

Ideally I need the same thread but with a nut on the top so I can wind it in with the plennum in place...

Any ideas where I can get one from?

 

Many thanks,

 

Dan