Misfire help ASAP
#61
I've had a significant stumble, but I couldn't decide if it was the mis-wired TPS or dirty injectors.
I probably won't have time to work on it for a few days, but I'll let you know if it improves. I had it out on the road today for the first time. It idles great but stumbles on harsh acceleration. Slow acceleration seems fine. I didn't get to go far though, I found one of the rear brakes is sticking, so I have to get under there and find out whats going on.
I probably won't have time to work on it for a few days, but I'll let you know if it improves. I had it out on the road today for the first time. It idles great but stumbles on harsh acceleration. Slow acceleration seems fine. I didn't get to go far though, I found one of the rear brakes is sticking, so I have to get under there and find out whats going on.
#63
#64
If this is so, check the pin output on the ECU, by carefully unwrapping the bundle of loom near the ECU plug and finding the yellow wire and testing it. If there is 5v there, but not downstream in the engine bay, you could splice in a new wire. Of course, the return wire from the TPS to the ECU could also be a problem, but one thing at a time!
On my rebuild, I managed to put a self tapping screw through the ECU/engine loom (on a perfectly post-rebuild previously running engine) where it crosses the (RHD) footwell, right at the end of the rebuild when I was fixing the wheelarch baffles! Found it eventually!
Greg
#65
#67
in this case Red is the wiper for the TP so it goes on pin B no matter what. and if you check from pin B to pin C you should read high resistance at idle and low resistance at WOT. the green wire goes here. if you check resistance from pin B to pin A you should get low resistance at idle and high resistance at WOT. the yellow wire goes here.
#70
#74
#75
#77
tps
Hi, as I said before, go download this book.
Kirby Palm's Jaguar XJ-S Help Book
Search for tps; comes up P305, will tell you all about replacements.
good luck
Pete
Kirby Palm's Jaguar XJ-S Help Book
Search for tps; comes up P305, will tell you all about replacements.
good luck
Pete
#78
#79
#80
this is bullshit. i checked all the TPS wires with an ohm meter and they all check good. checked the IAT wires with an ohm meter and theyre good as well. IAT isnt getting any voltage and TPS isnt getting any voltage either. WTF?!?
i checked pin 20 and 21 on the ECU, which is the 5 volt output for the IAT and its not reading any voltage at all. i checked pins 19 & 20 and theyre not reading voltage either. same goes for 19 & 7 and 20 & 7.
im really starting to lose patience with this car. im already sourcing an L67 and a 5 speed out of an F body.
i checked pin 20 and 21 on the ECU, which is the 5 volt output for the IAT and its not reading any voltage at all. i checked pins 19 & 20 and theyre not reading voltage either. same goes for 19 & 7 and 20 & 7.
im really starting to lose patience with this car. im already sourcing an L67 and a 5 speed out of an F body.
Last edited by M90power; 03-29-2012 at 05:36 PM.