Misses When Humid?

[jimgunthorpe]

hey there my 2001 4x4 4.3 blazer will miss if its real muggy out. did a full tune up (cap,roter,plugs, and wires). still does it? and ideas? thanks much

[Airjer_]

Spray down the coil with water and see if it arcs

[ken_man_1]

Originally Posted by jimgunthorpe

hey there my 2001 4x4 4.3 blazer will miss if its real muggy out. did a full tune up (cap,roter,plugs, and wires). still does it? and ideas? thanks much

What cap did you buy? If you didn't get an OEM cap, you may be just reinstalling a problem. I've found that Autozone/Advance Auto/O'Reilly/Napa (even Gold) caps are not a suitable replacement. I've only done a full tune on my blazer 2 times. The first time was Autozone crap. The second time was only a week after the first time - with an OEM cap and rotor. I was having exactly the same trouble as you state. My Blazer is a 2000 - I'm over 5 years on the tune-up, and just had to replace cap/rotor this spring. Food for thought. Also, make sure there is no moisture under the cap.


If you have the chance, and it's doing it when it's dark outside - pop the hood (disconnect the hood lamp) and look for arcing. If you see arcing, then you found your problem.

[jimgunthorpe]

this is my 3rd cap/rotor (original,1 from advance auto parts, and 1 from Napa) still having the problem i will do what you said and re-post thanks much

[ken_man_1]

Yep. Napa's caps are garbage. I had one in a truck that only lasted about 2 weeks and started arcing through the cap. That was real nice - in the middle of a blizzard.