Multiple Service Engine Soon codes?
Thread Starter
Racer
Joined: Jul 2001
Posts: 253
Likes: 0
Multiple Service Engine Soon codes?
I've got an '86 Coupe with a 4+3 - no mods. (tried to cut out the screens, but had trouble getting it to 'crack')
No SES light for a couple weeks since I found a vacuum leak to the EGR. Driving in to work today - in the rain - just cruising a nice 55 mph... All of a sudden I feel a power loss, then normal, and repeat a couple more times, and there's the SES light.
I get to an intersection and the idle is OK, then it drops to '4' on the digi-dash rpm indicator for just a quick second. Then the idle is a little erratic, and then back to normal.
I pull into work's parking lot and pull off my ALDL cover (yes, I've got one) and plug in my paper clip: 33 (MAF - Mass Air Flow Sensor Circuit), 42 (EST - Electronic Spark Timing Circuit), 43 (Knock Sensor). :eek:
Is there a single event that would cause all 3 of these things to go wacky at the same time? Or does the MAF affect the EST, which hit the Knock Sensor? :confused:
It's a good thing the wife wasn't driving it - She's wanted to sell it because she wants a car to run perfect all the time. I've told her that I've cleared up all of the codes and now this happens! :boxing :rolleyes:
TIA
No SES light for a couple weeks since I found a vacuum leak to the EGR. Driving in to work today - in the rain - just cruising a nice 55 mph... All of a sudden I feel a power loss, then normal, and repeat a couple more times, and there's the SES light.
I get to an intersection and the idle is OK, then it drops to '4' on the digi-dash rpm indicator for just a quick second. Then the idle is a little erratic, and then back to normal.
I pull into work's parking lot and pull off my ALDL cover (yes, I've got one) and plug in my paper clip: 33 (MAF - Mass Air Flow Sensor Circuit), 42 (EST - Electronic Spark Timing Circuit), 43 (Knock Sensor). :eek:
Is there a single event that would cause all 3 of these things to go wacky at the same time? Or does the MAF affect the EST, which hit the Knock Sensor? :confused:
It's a good thing the wife wasn't driving it - She's wanted to sell it because she wants a car to run perfect all the time. I've told her that I've cleared up all of the codes and now this happens! :boxing :rolleyes:
TIA
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Re: Multiple Service Engine Soon codes? (86VetteBill)
Well I don't know why they would be connected unless the rain has something to do with it. Is a wire/connector exposed to elements?
Good Luck:)
Good Luck:)
Thread Starter
Racer
Joined: Jul 2001
Posts: 253
Likes: 0
Re: Multiple Service Engine Soon codes?
Well, the SES light wasn't lit on my way home last night. I'm going into the garage to check out the wiring. Nothing obvious from my first look at eveything. :confused:
I guess the rain might have had something to do with it - but all 3 items at once? That's why I thought they might be 'connected' in some way...
THe wife says it's good thing she wasn't driving it at the time - it would be at the bottom of Lake Michigan! :smash:
I guess the rain might have had something to do with it - but all 3 items at once? That's why I thought they might be 'connected' in some way...
THe wife says it's good thing she wasn't driving it at the time - it would be at the bottom of Lake Michigan! :smash:
Team Owner
Joined: Sep 2001
Posts: 62,139
Likes: 1,728
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: Multiple Service Engine Soon codes? (86VetteBill)
usually if you fix the one closest to the front first one of the other codes will fix itself. Fix the 33 first and see if the other two go away
