R32 Gtr Flooding Up

[Grant T D]

I have just bought a 1990 R32 GTR and have had it for two weeks now but only got to drive it for one.

The problem occured when i was driving along at 100 in 5th and the car fuel surged. It was just after i had filled the car up with fuel so initially thought it could have been bad fuel.

I gave it a bit of a strapping to see if i could get it to surge again but no such luck. The car was boosting up fine but seemed to be lacking abit of power.

I pulled up at an intersection and the car died on me. I started it up and it was flooding up and running rough. It wouldn't rev over 3,000 and was detonating popping flames out the exhaust. I babied it home and got to work the next day trying to find a problem.

The car starts and idles fine for the 1st 10 to 20 sec then starts to run abit rough then you give it a few revs and it sounds like its hitting a governer at around 3,000 and runs extremely rough at idle.

I replaced the spark plugs as they were foweled real bad. Problem still occured.

I figured i should start with the basics as it was running so rich and flooding the car up so much it may have been a fuel pressure problem. I grapped a set of pliers and held the car at about 1,500 where it was running really bad and applied pressure with the pliers to the fuel hose feeding the motor. Bingo car instantly ran better and i could now rev it to 5.000 before i couldn't regulate the fuel enough.

I replaced the fuel reg and still problem occurs. Replaced the Map sensor and still no help. Unplugged the AFM individually and they work like they should. I have had the scan tool on it from work and its showing no codes but indicates that the fuel mixture is rich which i already know by how much black smoke the car is pumping out. The others mechanics at work have as much idea about the car as me. I have checked the 3 main causes that contribute to this kind of problem but am lost on what to do next.

If anyone has encounted a problem like this or might know why the car is getting so much fuel please help.

One last thing the car is completely standard.

[Moodles2]

Replace the fuel pump, its 21 years old now. Bosch 044 or genuine Walbro pump

[mad082]

generally a failing fuel pump should make it lean out, not run rich. and besides, all the fuel pump does is supply the fuel, the fuel pressure reg and injectors are what controls how much fuel makes it into the clyinders. my guess is that there is an issue with an injector or possibly even the fuel return line to the tank. i also wouldn't rule out the AFM just yet. it may be worth plugging in the scan tool when it is playing up and seeing what the voltage reading is. if it is drastically different between the 2 then one has an issue.

it may also be that you have an intake leak somewhere, since that will cause the car to run rich.

[Grant T D]

No Issues with the fuel return checked that already. When the scan tool was plugged in there was no real difference with voltage for the AFM's. Am looking for an air leak but no luck as yet. Might chuck in some air flow meters just to be on the safe side but doesn't sound like there going to be the problem.

[mad082]

yeah the chances of both being stuffed is pretty minimal, but if you can borrow some to try would be worth the few mins it takes to do it.

might be worth checking that your bov's are closing properly and not leaking

[SIR-032]

How did you go with your problem ?

Poping flames out the exhaust sounds like the CAS (crank angle sensor)

Or wide gap on plugs they should be 0.8mm not 1.1mm

good Luck

[Grant T D]

Of all the things to go wrong. Blown off cooler pipe in front of LH wheel arch. Causing the AFM's to give a wrong signal. I dummied up an intake from the turbo's to the plennum cancelling out the cooler and car ran fine. Off with the front bar and fixed the problem. Glad its back and running fine.