I finally got my 1990 SWB TT Manual running and mot on Friday,

The first drive of approx half a mile went perfect, engine boost well, acceleration as I would expect having owned two others previously.

then suddenly the car wont rev very high, if I pull off in first it initially feels good up to 3000rpm then hits a wall, change to second and it only gets to 2500 before same loss of power, maximum speed i can get is 40mph and that's feathering the throttle.

As the car has been standing for 4 years and the fuel pump noisy I immediately thought the fuel pump- I took this out of the tank and it didn't seem too blocked so cleaned with brake cleaner and re-installed.

Again car started off as it should but 500yds down the road the fault came again. So ive ordered a new fuel pump.

I have also looked at the safety boost mode, checked continuity from ecu pin to the Knock sensor wire and this is fine.

Total resistance to earth from the ecu pin and through the knock sensor is 560 k ohms, ?? on searching the net i have notice other mentioning 1000 Kohms. (could this be the problem) other people have mentioned in safety boost they still drive normally just loose top end??

I've tried resetting ecu and fault is still present.

 

The other symptom that leads me to the fuel pump is if I rev the car slowly from 800rpm increasing slowly at 5000rpm the engine dies with no more revs, doesn't cut out but acts like no more fuel,

 

Has anyone had a similar fault and am I on the right track

 

Thanks

John

safety boost isn't that noticeable it merely limits the boost to 7psi.

thats the answer i was looking for, thank you I hope this fuel pump is the answer

Thanks again

John

1st thing i'd do mate is a quick 10 min ECU diagnostics and see what error codes you get as 1st part of your thread was like a knackered MAF.

 

Smithy

Cheers smithy,

I did a check and the only code was 34, this is the knock sensor but I found a basic problem there with the connector, that been corrected now.

 

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Ive bought a walbro fuel pump off the net, is this a basic job to change??

disconnect the battery for half hour then plug back in, that will clear the codes,however as smithy said I think it sounds a little more than a fuel pump. could be maf or tps or a boost leak. years of sitting around could have seen rubbers going hard and poppin off splitting etc. and the wet weather recently is greta for fecking your maf.

i will try the battery for half hour now, because i did disconnect for an hour when taking the pump out and it ran correct for a short time after that.

Do you know what rating your fuel pump is? cos the Zed fuel pump is pretty high see and you don't wanna be less unless it was advertsied to flow the same as the Zed one.

smithy

its a walbro 255lph? was listed as for the 300zx tt

John