Out of the blue, started having a rough idle

ANONYMOUS

MEMBER
1984 NISSAN TRUCK
140,000 MILES

Out of the blue, started having a rough idle. Had to increase the idle to around 1000 rpm's just to keep it running.
Found several vacuum hoses with cracked ends and replaced all one at a time. Removed the pcv valve and cleaned and tested, works fine. Used carb. Cleaner to clean carb and it stopped idling rough for a few minutes and
then went back to rough.

Check distributor and plugs.

Any thoughts?

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Sounds like a Carb problem-replace the base gasket and see what happens-also is this a Z24 NAPZ engine

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Sunday, October 21st, 2012 AT 10:35 PM

MR. TYLER

MEMBER
3 POSTS

Yes, Z24. Also checked the pcv valve yesterday and the egr valve. Both are good. This truck
does have a VVT (venturi vacuum transducer valve) which feeds the egr.

If I spray carb. Cleaning into the VVT, it seems to run normal for a minute. Also, if I spray
carb. Cleaner at the base of the carb. At the back of the unit the engine tries to die.