Code 34
Drifting
Joined: Feb 2005
Posts: 1,592
Likes: 3
From: St Louis MO
Assuming '86 and '87 are pretty much the same, did you change the MAF sensor relay and the power relay when you changed MAF? They are only about $11.00 ea. They are mounted behind battery on firewall, on my car. If you replace, disconnect battery first (this will also clear code). After replacing and reconnecting battery, start car and idle for about 4-5 min. to see if it throws a code 34 again.
To quote part of "the book", "A code 34 may be caused by an engine that exhibits a low, rough, unstable or incorrect idle problem. If this condition exists, disconnect the MAF sensor. If the idle improved with the sensor disconnected, replace it" (which you say you have done). " With the MAF sensor disconnected, the ECM should see a high signal voltage and set a code 33. If a code 34 resets, then the wiring or ECM is at fault".
Check for a loose or damaged, split, air duct between MAF and throttle body. "Code34 can also be from a dirty or misadjusted throttle body".
Remember to disconnect battery for 2 min or so when adjusting or replacing parts, so that existing codes will clear.
Hope this helps a little bit. Good luck
To quote part of "the book", "A code 34 may be caused by an engine that exhibits a low, rough, unstable or incorrect idle problem. If this condition exists, disconnect the MAF sensor. If the idle improved with the sensor disconnected, replace it" (which you say you have done). " With the MAF sensor disconnected, the ECM should see a high signal voltage and set a code 33. If a code 34 resets, then the wiring or ECM is at fault".
Check for a loose or damaged, split, air duct between MAF and throttle body. "Code34 can also be from a dirty or misadjusted throttle body".
Remember to disconnect battery for 2 min or so when adjusting or replacing parts, so that existing codes will clear.
Hope this helps a little bit. Good luck
Team Owner
Joined: Sep 2003
Posts: 20,172
Likes: 672
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Did you clear the old code? You might also check the Memcal number and post it up here. I found that the BUA1728 is a replacement for some of the earlier vers for the reason of throwing false MAF codes.
JRC
Last edited by JrRifleCoach; Mar 4, 2005 at 10:51 AM.
Pro
Joined: Jul 2004
Posts: 632
Likes: 0
From: Smithfield VA
Originally Posted by rlane5
I got a code 34 which is a maf on my 86 vette I replace it with a new bosch maf and I till have the same code any suggestion?
Randy,
Randy,
Good luck.
