My G/F's father has a 1992 Nissan D21 2WD 2.4 5-speed pickup that has
> developed a problem that seems fuel related. It's been doing this on
> and off for nearly 1.5 years, but last week the clutch was replaced
> and since then, it's gotten too bad to drive.
>
> What happens:
>
> The truck idles fine, but as soon as you open the throttle it acts as
> if it's not getting any fuel - total bog. If I pull the air cleaner
> and spray WD-40 in as he opens the throttle, the engine starts to rev
> and act better. As soon as I stop spraying, it leans out and bogs
> right back down. Reminds me of a lawn mower running out of gas. >
> So far the truck has had a complete tune-up (plugs, wires, cap, rotor,
> air filter, fuel filter, etc) and last year the fuel pump was replaced
> to try and solve the problem back then. That didn't fix it so we
> replaced the fuel pressure regulator. I get the feeling it's a fuel
> pressure problem. I have a fuel pressure tester, but it needs a
> shrader valve and this truck doesn't have one on the fuel rail-that I
> can find anyway. I could always build something with a T and valve,
> but I figured I'd post here first to see if this is a common problem
> with a common fix. I did remove the line from the filter and when
> power was applied, there was a powerful flow of fuel that was hard to
> hold back with my finger. I also tested the TPS and from what I can
> tell with an ohm meter, it works fine. About 15 ohms across and a
> smooth reading from the potentiometer when throttle is opened then
> closed - 1.5 ohms to 13 ohms, testing from ether side of the
> potentiometer.
>
> I don't know very much about Nissans, but this appears to be a MPFI
> engine. No crazy dual-spark setup or anything like that.
>
> So any ideas? What should the fuel pressure be? I'm guessing
> somewhere around 60psi?
>
> Thanks in advance!!
> Dieter
Have you thought about new injectors? Just wondering...
~Bhuvan