87 Nissan king cab Z24-Bucks like crazy as engine revs! Any ideas!

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Darryl Howell - 17 Sep 2005 23:34 GMT

I have checked the distributor cap and changed the spark plugs. The coils
and associated transistors appear to be fine. The fuel punp is outputting
40 PSI so I assume it is correct althiugh I thiught 20PSI was more in line.
I can't determine if it is a fuel or ignition related problem. Don't want
to spend a fortune to find it. Can anyone help with this problem. It
starts and idles perfectly then as the revs pick up in each gear it starts
to buck wildly. If you go to the next gear it runs smoothly again until the
revs hit Approx. 2500-3000(I don't have a tach). At my wits end!

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remco - 18 Sep 2005 02:50 GMT

> I have checked the distributor cap and changed the spark plugs. The coils
> and associated transistors appear to be fine. The fuel punp is outputting
[quoted text clipped - 4 lines]
> to buck wildly. If you go to the next gear it runs smoothly again until the
> revs hit Approx. 2500-3000(I don't have a tach). At my wits end!

You probably already replaced the fuel filter?
I'd check to make sure that pressure is correct - too much pressure can
cause problems as well. Not sure where your fuel pressure regulator would be
located, though.

Remco

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larry - 18 Sep 2005 04:19 GMT

I could be wrong but it sounds like the computer is putting the motor in
"safe mode".

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Randy - 18 Sep 2005 18:16 GMT

the most common problem is a bad injector or open circuit to an injector

> I could be wrong but it sounds like the computer is putting the motor in
> "safe mode".
[quoted text clipped - 13 lines]
>
>>revs hit Approx. 2500-3000(I don't have a tach). At my wits end!

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