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Necoa #: 1318
Location: San Marcos, CA USA
Joined: Aug 01, 2003
Posts: 181
Posted: Wed Apr 04, 2007 8:50 am Post subject: TPI problem help please!
Hello,
Well I finally finished my upgrade to an 89 Trans-Am F.I. system. The system works great except for a couple of problems. The main problem is I get a error code of 36 which is (MAF sensor burn-off voltage was missing), this will come up after 1-2 days of driving. We have checked this out and of course everything check out and is operating correctly. We have replaced the MAF with a new unit stock which I belive is 48mm. This engine is a 350 with stock ruinnes and stock upper plenum, with Edelbrock lower plenum, edelbrock cam(number 3702) the specs for the cam are : Duration 268int 288exh, @.050 194int 214exh / Lift @Cam .265int .294exh, @ valve .398int .442exh / Timing intake 10'ATDC open 24ABDC close Exhaust 44BBDC open 10BTDC close. The air intake is a Cold Air K&N 3" coming in. The exhaust is Thorley Tri-Y headers going into a custom 3" exhaust all the way to a flomaster muffler then shrinking to eihter a 2 5/8 or 2 3/4 pipe for the last portion. Also have a stage 1 tbichips custom chip( bought it mainly to turn the fans on sooner), I have this problem regardless of the chip thats in. The Elkie runs great for the most part it idles a little ruff but not bad also every once in a while I can smell fuel vapor kinda like raw fuel but upon inspection we cant find any leaks, I thought it might be coming from the purge cannister but at this point I'm just guessing. I talked to an "engine specialist" and He mentioned that it might be the MAF bieng to small for the amount of air coming and and the computer might be trying to compensate by duping more fuel in causing a overly rich condition and therfore throwing the code I'm not sure about this what are your thoughts? He recommended going to a 52mm MAF, I thought checking with the experts before I spent more money would be a better idea. Sorry for the long post but any help woudl be great!
Necoa #: 478
Location: 17(S.CA,S.NV)
Joined: Oct 10, 2002
Posts: 1637
Year: 1982
Model: El Camino
Posted: Wed Apr 04, 2007 8:55 pm Post subject:
Quote:
MAF bieng to small for the amount of air coming
I'm no expert but this is wrong. You cannot have more air then the smallest point in your system. If your MAF is a 48mm you're not going to get too much air coming in for it. You'll get no more then a 48mm opening will allow.
Have you checked all of the connectors for the MAF to make sure there is no dirt/grease etc. that could be causing a connection problem? _________________ '82 El Camino with an LT1 from a 95 Impala SS
Necoa #: 1318
Location: San Marcos, CA USA
Joined: Aug 01, 2003
Posts: 181
Posted: Thu Apr 05, 2007 10:30 pm Post subject:
Yes, I and other mechanics have checked to make sure the connections are are clean and making good contact. In regards to the amount of air coming in, I would tend to agree with you what your saying makes sense to me. I'm stumped and don't know which direction to take. I have been looking for an expert in my area but have yet to find someone with the knowledge to help me out. If ANYONE can help PLEASE!!!
I'm no expert either, but i'm a llitle confused about the size on the maf(mass air flow). 48 mm seems to small for a maf which should be around 3 inches(75-76mm), aprox. the same as the air intake. Could your mechanic possibly be meaning the throttle body?? 48/52 mm makes much more sense for the throttle body, 48 mm is stock size. _________________ 1983 Chevy El Camino 350 tpi V8, the REAL car!
1995 Chevy s-10 Blazer 4,3 V6, daily driver.
1965 Ford Taunus 20M 2,8 V6, just for the trouble.
Necoa #: 478
Location: 17(S.CA,S.NV)
Joined: Oct 10, 2002
Posts: 1637
Year: 1982
Model: El Camino
Posted: Sat Apr 07, 2007 9:16 pm Post subject:
I just did a quick search and came with this:
MAF sensor burn-off voltage was missing. Check MAF sensor burn-off relay and terminal "D" on MAF.
and
Code 36 on 5.0L and 5.7L engines that use the Bosch hot-wire MAF, if the burn-off cycle after shut-down fails to occur.
Found this on a Vette site: SERVICE ENGINE SOON LIGHT-CODE 36 (MAF SENSOR BURN-OFF FAULT)-PUGGED CRANKCASE V ENT TUBE OR FAULTY MAF POWER OR BURN OFF RELAYS-TEST RELAY-REPLACE THE RELAY-ALL 1986-87 CHEVROLET CAMARO/CORVETTE MODELS WITH PFI ENGINES (VIN CODES F AND
and..... MASS AIR FLOW (MAF) SENSOR SYSTEM DIAGNOSIS CODES 33/34 AND 36-MAF POWER RELAY S HOULD BE P/N 10067925-IF NOT REPLACED WITH P/N 10067925-ALL 1986 TO 1987 CHEVROL ET CAMARO AND CORVETTE MODELS WITH 5.0L OR 5.7L PFI ENGINES
Don't know if any of this will help but maybe it will point you in the right direction. _________________ '82 El Camino with an LT1 from a 95 Impala SS
Necoa #: 1318
Location: San Marcos, CA USA
Joined: Aug 01, 2003
Posts: 181
Posted: Mon Apr 09, 2007 12:49 pm Post subject:
Poltergeist,
Thanks for the info. I will check the vent tube. Also, I mean to say the Throttle body not the MAF in regards to size. 48mm is the stock size vs. either 52 or 58 mm for the larger size. I let you guys know if this works or not.
Necoa #: 594
Location: 13(TX)
Joined: Feb 03, 2003
Posts: 287
Year: 1984
Model: El Camino
Posted: Mon Jul 02, 2007 8:58 pm Post subject:
With all MAF codes on TPI engines start with replacing the MAF power and burn off relays.
And with poor drivability or goofy things you can't explain even if the numbers all look good on the scanner replace the MAF power and burn off relays. The power relays is the first to go bad as it has current flowing through it all the time the engine is running.
When replacing a MAF on a TPI Do not buy a rebuilt Bosch unit. Buy a brand new unit. There is a better replacement that does not use the hot wire. It is sold under the wells name Filco and another. If you can find a Filco dealer they are the cheapest. It's nearly impossible to find anyone who sells Filco. _________________ Robert Adams
http://gparts.freeyellow.com
84 Conquista
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