maf testing
Pro
Joined: Oct 2001
Posts: 682
Likes: 23
From: loxahatchee fla
Re: maf testing (atotalnincompoop)
if its not working you should have a code 34 on the trouble codes
a digital metter should show readings between
.4 Volts @ idle, 5 Volts @ Full Throttle.
a quick visual check should show
the hair thin wire inside the MAF should turn red hot for just a second or so after the key is turned off after the cars been running awhile
http://www.c4vettes.com/sensorinformation.htm
SERVICE ENGINE SOON LIGHT CODE "33" MAF SENSOR VOLTAGE HIGH-PERFORM DIAGNOSTIC C HECK FOR CODE 33 FOUND IN 1986 SHOP MANUAL-CHANGE MAF POWER RELAY-MAF POWER RELA Y NEW P/N IS 10067925-ALL 1986 CHEVROLET CAMERO MODELS WITH LB9 ENGINE (ENG. COD E F), AND 1986 CORVETTE WITH L98 ENGINE (ENG. CODE 8)
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 8)
READ THIS!! http://www.c4vettes.com/maf.htm
http://www.c4vettes.com/ecm.htm
http://www.asashop.org/autoinc/oct98/techtips.htm
[Modified by grumpyvette, 2:21 PM 6/26/2003]
a digital metter should show readings between
.4 Volts @ idle, 5 Volts @ Full Throttle.
a quick visual check should show
the hair thin wire inside the MAF should turn red hot for just a second or so after the key is turned off after the cars been running awhile
http://www.c4vettes.com/sensorinformation.htm
SERVICE ENGINE SOON LIGHT CODE "33" MAF SENSOR VOLTAGE HIGH-PERFORM DIAGNOSTIC C HECK FOR CODE 33 FOUND IN 1986 SHOP MANUAL-CHANGE MAF POWER RELAY-MAF POWER RELA Y NEW P/N IS 10067925-ALL 1986 CHEVROLET CAMERO MODELS WITH LB9 ENGINE (ENG. COD E F), AND 1986 CORVETTE WITH L98 ENGINE (ENG. CODE 8)
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 8)
READ THIS!! http://www.c4vettes.com/maf.htm
http://www.c4vettes.com/ecm.htm
http://www.asashop.org/autoinc/oct98/techtips.htm
[Modified by grumpyvette, 2:21 PM 6/26/2003]
Pro
Joined: Oct 2001
Posts: 682
Likes: 23
From: loxahatchee fla
Re: maf testing (grumpyvette)
btw Id highly recomend you get a copy of this book, it will help new guys get a grip on testing http://www.amazon.com/exec/obidos/AS...684686-7069662
Burning Brakes
Joined: Feb 2003
Posts: 1,246
Likes: 1
From: SouthBend IN
Re: maf testing (grumpyvette)
i thought i had a problem with my MAf and after hours and days of stress it turned out to be the connector to the MAF.
Your 85 doesn't have a burn-off relay, instead it has a burn off module behind the bread box. Test the wire first by turning ign on position ( car not running) then jumper the A and Eor F ( top row second from end) and turn ign off, wire should glow for 4 sec. To do this just set the MAF on the plenum.
mine ended up being the plug, i had to tighten up the positive connection place with a small screw driver.
Your 85 doesn't have a burn-off relay, instead it has a burn off module behind the bread box. Test the wire first by turning ign on position ( car not running) then jumper the A and Eor F ( top row second from end) and turn ign off, wire should glow for 4 sec. To do this just set the MAF on the plenum.
mine ended up being the plug, i had to tighten up the positive connection place with a small screw driver.
