ok check engine light question....
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Joined: Oct 2004
Posts: 63
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From: Clermont Florida
ok check engine light question....
some days i will start my 87, and the check engine light is on....car runs like crap....i shut it off and viola, its out, and it runs and idols good for a while, but then i step on it, and make it go, and it does go, but then it seems like it chokes itself...it goes like a bat out of hell for a few seconds and then boggs down, then , on comes the light.....so i get the code key out , check the codes, and i usually get a 34, and a 43, or 1 or the other, or both...so can some one help me to narrow the problem down, is it for sure my maf or, is something causing the maf to produce a code...any help would be cool...thanks, joe
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Code 34 is the MAF reading too little air flow for the throttle position.
Remove the air cleaner assy, start the engine and watch the MAF sensor wires as someone shuts off the engine. The sensor wires should glow bright red for a few seconds. If so, replace the MAF power relay; if not eplace the MAF burn off relay.
If that does not fix the code 34 issue replace the MAF.
Code 43 is the the knock sensor not passing the ECM test when you go to heavy throttle. It's likely that this code will go away when you fix the MAF issue. If not come back here.
Remove the air cleaner assy, start the engine and watch the MAF sensor wires as someone shuts off the engine. The sensor wires should glow bright red for a few seconds. If so, replace the MAF power relay; if not eplace the MAF burn off relay.
If that does not fix the code 34 issue replace the MAF.
Code 43 is the the knock sensor not passing the ECM test when you go to heavy throttle. It's likely that this code will go away when you fix the MAF issue. If not come back here.
Last edited by 65Z01; Nov 26, 2004 at 05:45 PM.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
If I may-I've read several times if you replace one relay-DO THEM BOTH. 
Oh yeah, and don't forget to disconnect the battery for a few minutes if you do replace the relays (BTW there cheap) to clear the codes.
Oh yeah, and don't forget to disconnect the battery for a few minutes if you do replace the relays (BTW there cheap) to clear the codes.
Last edited by rick lambert; Nov 27, 2004 at 10:24 AM.
