I'm having problems with my engine running like crap and have gotten alot of suggestions of what it could be so how can I tell if my MAF is bad and aslo how do oyu know when the fuel pump id bad?

 

If the MAF is bad, the car will idle smoother when its unplugged.

If the fuel pump is bad, the car wont run, because its not getting any fuel!

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Try hitting it! No joke! Ok, actually a quick way to check the MAF is to tap on it while the car is idling and see if the car stumbles. It's inside that big air boot-thing, so try giving the boot a few good smacks. As for the fuel pressure, a high pressure gage is the best way to check it. A car can still run with a bad fuel pump. A lot of times the fuel pump will will be "sick" instead of "dead".


[This message has been edited by ViciousZ (edited December 07, 2000).]

 

Nell,

Get your hands on a DMM with very slender probes. Test the voltage output of the MAF at idle (about 800-850 RPM). The output should be about like this:



A MAF on a 350CID engine should indicate about 800 mV at the same idle speeds, and about 1.80-2.10 VDC at 3,000 RPM in neutrl/Park.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

Mine threw code 33 when the MAF went out.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

 

Thanks for the help I'll try to chck it tomorrow hopefully it's not bad but at least I'll know what is causing my problems