Okay, I have replaced all the relays, and tested the TPS, which is operating fine. The car dies with the MAF connected, but will run with it disconnected. Also, when I do get it to run with the MAF connected, as soon as I touch the gas pedal it instantly kills it. Should I replace the MAF or take a look at the ECM? I would assume the MAF would be the culprit in this case, but I don't know. I was getting codes 33 and 34, but when I reset everything, I can't get them to come back. Any help or advice would be greatly appreciated. Thanks

Matt

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irocet@hotmail.com

drive.to/Stang_Kilr

88 IROC-Z -- 350 L-98, 700R4, Flowmaster, Edelbrock Headers, Catco Cat, K&N, MAF Sceens Removed, Airfoil, March Pullies, Comp Cams Magnum 1.6 Roller Rockers, Bosch Platinum Plugs, Accel 8.8 mm Wires, MSD 6AL, Hypertech Cap & Coil, Hypertech Chip, Hotchkis Strut Tower Brace

 

Hello, with the maf sensor disconnected, the ecm will run on fixed settings...usually rich. sounds like a bad maf sensor. best of luck. tom

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86 iroc 305tpi auto. mild cam

 

Yep, 99% sure it's a bad MAF, but for S's and G's, swap the MAF burnoff relay and the MAF power relay, see how it does then.

 

Well, thanks for the replies. I'll go with the assumption that it is a bad MAF. I already replaced both relays and it did nothing to help the situation, so.... I can't believe that thing went bad within 15 months. What a waste of money! Oh well, that is the way it goes I guess. Thanks again.

Matt

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irocet@hotmail.com

drive.to/Stang_Kilr

88 IROC-Z -- 350 L-98, 700R4, Flowmaster, Edelbrock Headers, Catco Cat, K&N, MAF Sceens Removed, Airfoil, March Pullies, Comp Cams Magnum 1.6 Roller Rockers, Bosch Platinum Plugs, Accel 8.8 mm Wires, MSD 6AL, Hypertech Cap & Coil, Hypertech Chip, Hotchkis Strut Tower Brace

 

Speed Density is your friend. No MAFs to waste your money on! LoL

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1992 Z28 5.7 TPI

ZZ4 longblock
Harland Sharp roller rockers
Accel base and SLP siamesed runners,
52MM SLP Throttle Body
Hooker Headers & Flowmaster catback
MSD6A ignition
aluminum driveshaft
World Class 5-speed

 

Oh yes, Speed Density, very nice

(I converted to it from the crappy GM MAF setup)


Brendan

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1987 IROC-Z, engine, tranny, and other "stuff"

 

oh yes, to help the conversation, before you go replacing the MAF sensor, check the MAF PLUG itself, the plug that plugs into the sensor, clean and check connectivity on each socket on it... if your getting a bad connection that will DEFINATLY cause a problem.

Brendan

 

Another thing to look at, "if you have not already" are your plug wires, for, if they are not up to the task at hand, or arcing you can get the same problems you have now. I have had this happen to me!

 

I don't know how much I believe its a bad maff. My car will rev to about 3k without a maf plugged in. My guess is he has a problem somewhere else. Sounds more like a broken
TPS.

WHen you put your hand over the TB, does the idle go up any?

Did you check for vacume leaks? I'm putting my money on TPS. See, the car will run and even drive w/out a MAF, but with TPS unplugged it will only idle, and the second you touch it it will die. Perhaps your TPS is reading some wacky stuff.

 

Not disagreeing with the last post, but if it was a bad TPS, why wouldn't I have gotten a code 21 or 22 when I did the scan. Instead I got a 33 and 34, which both are MAF related. I know that codes can mean one thing, but there are many parts to the system, so things can be interelated. I did test the TPS and I was get right around .40dcv like my Chilton's manual says I should. I still think it is the MAF, but I will know tomorrow when I replace it.

Matt

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irocet@hotmail.com

drive.to/Stang_Kilr

88 IROC-Z -- 350 L-98, 700R4, Flowmaster, Edelbrock Headers, Catco Cat, K&N, MAF Sceens Removed, Airfoil, March Pullies, Comp Cams Magnum 1.6 Roller Rockers, Bosch Platinum Plugs, Accel 8.8 mm Wires, MSD 6AL, Hypertech Cap & Coil, Hypertech Chip, Hotchkis Strut Tower Brace

 

Well, I replaced the MAF today and the thing fired right up, revs, and more importantly...drives! I don't if anyone is interested in that or not, but I thought I would get it out there. Thanks to everyone who posted about this for me. I learned a great deal about the MAF, TPS and relays from this adventure.

Matt

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irocet@hotmail.com

drive.to/Stang_Kilr

88 IROC-Z -- 350 L-98, 700R4, Flowmaster, Edelbrock Headers, Catco Cat, K&N, MAF Sceens Removed, Airfoil, March Pullies, Comp Cams Magnum 1.6 Roller Rockers, Bosch Platinum Plugs, Accel 8.8 mm Wires, MSD 6AL, Hypertech Cap & Coil, Hypertech Chip, Hotchkis Strut Tower Brace

 

Glad to hear it's working again. And glad to hear it wasn't the ECM.



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1987 Camaro IROC-Z
350 TPI (L98), HyperTech Airfoil, K&N Filters and modified airboxes, AC Delco RapidFires, Taylor SpiroPro 8mm wires, Energy Suspension polyurethane bushings for front and rear LCAs and sway bars, KYB struts and shocks, BFG g-Force Z-rated tires, MAC STB, MAC SFCs, JET low temp stat, CarSound Hi-flow Cat, 3" Mandrel-bent pipes, Flowmaster muffler, Corvette Servo, TransGo Shift Kit, Corvette 2000 Stall, TruCool LPD tranny cooler, T-tops.

2001 Sunfire GT
2.4L, 5-speed, K&N cone filter, interior detailing, 200W Monsoon Sound System (8 speakers), Silver Metallic exterior with grey interior.

Web: http://www.angelfire.com/on3/whitelightening

 

too bad it wasn't the ecm because from my understanding a new computer (ecm) is cheaper than a new maf sensor by a bunch
Andrew

 

It is funny, because I looked up the price for a new ECM and it was about $100. The new MAF cost $180 + tax = $190. Kinda strange how that works. Also, I will never buy another sensor or whatever from NAPA. I got the exact same sensor from Advance Auto Parts for half what NAPA wanted, plus I got a lifetime warranty vs. NAPA's 12 months. Apparently it is more common now to get the MAF with the circuit board in it, cause that is two in a row from different companies that have been like that instead of the stock GM filament style. I like that alot better. Thanks again...and man it felt good to drive the IROC again after 4 days! Later

Matt

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irocet@hotmail.com

drive.to/Stang_Kilr

88 IROC-Z -- 350 L-98, 700R4, Flowmaster, Edelbrock Headers, Catco Cat, K&N, MAF Sceens Removed, Airfoil, March Pullies, Comp Cams Magnum 1.6 Roller Rockers, Bosch Platinum Plugs, Accel 8.8 mm Wires, MSD 6AL, Hypertech Cap & Coil, Hypertech Chip, Hotchkis Strut Tower Brace