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1993 Isuzu Amigo X 2.6L
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Discussion Starter · #21 ·
Usually LEAN will have a white, and almost blistery looking plug. Vacuum leaks at idle are usually caused by leaking vacuum hoses, most times due to cracked ends. A ROUGH idle, may be a bad PCV valve (does it rattle?), could be a carboned over valve (and there are PCV valves that LOOK correct, but are the wrong valve). Rough idle can also be a leaking EGR valve (EGR does not allow fresh, ''burnable" air, but an inert exhaust air mix). Dennis
Hey Dennis, the original ones didn’t look that bad when I took them out, I was actually surprised. But yes it does rattle somewhat, the vehicle that is. I can buy a new egr valve as those are dirt cheap. The PCV valve isn’t exactly expensive either, but I’ll try looking at the hoses again
 

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Registered
1993 Isuzu Amigo X 2.6L
Joined
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29 Posts
Discussion Starter · #22 ·
Usually LEAN will have a white, and almost blistery looking plug. Vacuum leaks at idle are usually caused by leaking vacuum hoses, most times due to cracked ends. A ROUGH idle, may be a bad PCV valve (does it rattle?), could be a carboned over valve (and there are PCV valves that LOOK correct, but are the wrong valve). Rough idle can also be a leaking EGR valve (EGR does not allow fresh, ''burnable" air, but an inert exhaust air mix). Dennis
Yes, there is a rattle and also a heavy bass rumble at times as well in idle only… like I said, it runs and drives perfectly fine. Lots of pick up (for only 120HP).

When I switch on the A/C, the heavy hum comes down a little bit, but sometimes it will come back. It does idle higher and louder when the A/C is off.
It’s just inconsistent when idling is all so it changes sometimes. Once in a while it will take a little longer to start as well, but the starter is good. Would this also be caused by vacuum leaks too?
 
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