Problem with 302..

Smokedawg · 01-30-2003, 01:17 PM

What would cause a 302 to fire up and run for about 10-30 seconds then as the rpm's fall to catch the idle the truck dies... Just like someone turned off the key..

New items already installed:
Plugs
Wires
Cap
Rotor
Fuel pressure regulator
Fuel filter

Thanks for any help..

Derek

fiveohpatrol · 01-30-2003, 01:25 PM

can you keep it running if you hold it at an RPM above idle?

Also, do you have a fuel pressure gage?

GhettoPop · 01-30-2003, 01:26 PM

Maybe try and clean the throttle body?

Smokedawg · 01-30-2003, 01:27 PM

If I keep my foot on the gas and hold it at 1K RPM's it will stay running all day long. As soon as it gets below that its like someone just killed the power.

Nixon1 · 01-30-2003, 02:58 PM

Any hissing? Maybe a vacuum leak? Is your...what's it called on these Fords...idle air bypass valve or something like that...it's an IAC valve on Chevys...is it clean and set properly? And also..MAF?

Smokedawg · 01-30-2003, 03:19 PM

No hissing sound...I dont know what or how to clean the IAC..Is it the cylinder shaped thing connected to the TB??

fiveohpatrol · 01-30-2003, 03:22 PM

yes it is. just take it off and clean it with carb cleaner

I'd also suggest checking the timing just to rule out one more thing.

01-30-2003, 01:17 PM	#1
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	Problem with 302.. What would cause a 302 to fire up and run for about 10-30 seconds then as the rpm's fall to catch the idle the truck dies... Just like someone turned off the key.. New items already installed: Plugs Wires Cap Rotor Fuel pressure regulator Fuel filter Thanks for any help.. Derek __________________ 1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc

01-30-2003, 01:25 PM	#2
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	can you keep it running if you hold it at an RPM above idle? Also, do you have a fuel pressure gage? __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

01-30-2003, 01:27 PM	#4
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	If I keep my foot on the gas and hold it at 1K RPM's it will stay running all day long. As soon as it gets below that its like someone just killed the power. __________________ 1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc

01-30-2003, 02:58 PM	#5
Nixon1 Registered Member Join Date: Jan 2003 Location: Palm Bay, FL Posts: 432	Any hissing? Maybe a vacuum leak? Is your...what's it called on these Fords...idle air bypass valve or something like that...it's an IAC valve on Chevys...is it clean and set properly? And also..MAF? __________________ '91 Mustang GT 5.0 AOD Daily Driver Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI 13.73 at 103.8, ~2.2 60'

01-30-2003, 03:19 PM	#6
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	No hissing sound...I dont know what or how to clean the IAC..Is it the cylinder shaped thing connected to the TB?? __________________ 1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc

01-30-2003, 01:26 PM	#3
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	Maybe try and clean the throttle body?

01-30-2003, 03:22 PM	#7
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	yes it is. just take it off and clean it with carb cleaner I'd also suggest checking the timing just to rule out one more thing. __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

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