Testing coils etc on 02 5.3
Thread Starter
Launching!
Joined: Jul 2004
Posts: 205
Likes: 3
From: Valencia Ca
Testing coils etc on 02 5.3 Suspect I may have coil or worse going out
Bone stock to the air filter 162k mi
Occasionally at a light Im getting very slight misfire, sometimes it will be more pronounced
I have a multimiter which I dont think Ive ever used
Best way to test these, what settting on the meter and what wires to test
Im horrible with diag/electric so make dumb it down much as possible. Trying to squeeze another year out of this before I can start putting together a fresh motor
Ill try and pull codes by tomorrow service engine light came on last week then shut off after a few days.
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In addition may have a flaky 02 sensor or 2 not sure. Way to test those or just replace? Front 2 cats are new didnt need, hate throwing money at something but with this many miles some of this stuff becomes maintenance
Suppose I oughta put some injectors in also prefer OEM where Im not having to screw with tunes, adapting stuff, different flow rates etc need to keep this one dead reliable. GM parts direct or?
Truck has been a little down on power for quite awhile needs a little love it seems. Not bad but noticeable
Bone stock to the air filter 162k mi
Occasionally at a light Im getting very slight misfire, sometimes it will be more pronounced
I have a multimiter which I dont think Ive ever used
Best way to test these, what settting on the meter and what wires to test
Im horrible with diag/electric so make dumb it down much as possible. Trying to squeeze another year out of this before I can start putting together a fresh motor
Ill try and pull codes by tomorrow service engine light came on last week then shut off after a few days.
-------------------------------------------------------------------
In addition may have a flaky 02 sensor or 2 not sure. Way to test those or just replace? Front 2 cats are new didnt need, hate throwing money at something but with this many miles some of this stuff becomes maintenance
Suppose I oughta put some injectors in also prefer OEM where Im not having to screw with tunes, adapting stuff, different flow rates etc need to keep this one dead reliable. GM parts direct or?
Truck has been a little down on power for quite awhile needs a little love it seems. Not bad but noticeable
TECH Addict
Joined: Aug 2005
Posts: 2,305
Likes: 126
From: Monroe,NY
Not to sure how to test the coils but if you have an infrared temp gun check each exhaust primary and the one with the temp a good amount lower than the rest is your bad cylinder. That is how I found a bad coil on my truck. The weird thing was idle and part throttle were rough but wot was still good. Changed bad coil on #8 cylinder 2 years and everything has been great since then.
Thread Starter
Launching!
Joined: Jul 2004
Posts: 205
Likes: 3
From: Valencia Ca
Long story short another sales pitch given for a grease em up job by a shop that I HAD trusted many times before. Still driving it...Ill throw parts at it myself. 
Meantime her high mile euro car is stuck in 1st. Fun fun.
what Id give to own a 70s carbed vehicle again
Meantime her high mile euro car is stuck in 1st. Fun fun.
what Id give to own a 70s carbed vehicle again
