EFI question - Pirate4x4.Com : 4x4 and Off-Road Forum

Ibuildembig · 07-25-2005, 09:06 AM

Hello, I have a question about my 302 EFI setup in my jeep. When its idleing it pulses up and down a few hundred RPM every so often. Any ideas on how to fix it?

Bluebeast393cid · 07-25-2005, 11:08 AM

possibly clean the IAC on the side of the throttle body... but there is a certian type of cleaner to use i just cannot think of it off the top of my head.. also may want to check to see if it is throwing codes if you have the whole EFI harness including all the relays and end plugs for checking codes...

Ibuildembig · 07-25-2005, 11:13 AM

Yeah I have a motorsports harness...the only codes it throws are canister and EGR, both of which are not on there. I thought it might be compensating for the compressioni, stroke, and cam selection. I will have to check that module tonight..thanks

Bluebeast393cid · 07-25-2005, 02:30 PM

has it done this before or have you just installed the engine?

if just installed you may need to stick a resistor in the EGR plug to make the computer think that it is operating correctly

MXPAZ · 07-25-2005, 05:32 PM

Mine does that when I have the idle too high. It acts like the computer is trying to lower the idle, but it cant because I have it idled up. Turned idle down and it stopped.

07-25-2005, 09:06 AM	#1 (permalink)
Ibuildembig Wheeler Join Date: Jan 2004 Member # 26504 Location: Fruitland MO Posts: 371	EFI question Hello, I have a question about my 302 EFI setup in my jeep. When its idleing it pulses up and down a few hundred RPM every so often. Any ideas on how to fix it? __________________ If you have a mullet and play video games, your not tellin me shit 68 F350 CC project 72 F350 CC for parts 79 F150 with tons on coils 88 F350 truggy 90 F350 beater truck 96 F250 CC DD

07-25-2005, 11:08 AM	#2 (permalink)
Bluebeast393cid Registered User Join Date: Apr 2004 Member # 29382 Location: Why Not Minot Posts: 88	possibly clean the IAC on the side of the throttle body... but there is a certian type of cleaner to use i just cannot think of it off the top of my head.. also may want to check to see if it is throwing codes if you have the whole EFI harness including all the relays and end plugs for checking codes... __________________ 90 Bko 393W/E4OD/BW1356 60/14 4.10s 4D2s

07-25-2005, 11:13 AM	#3 (permalink)
Ibuildembig Wheeler Join Date: Jan 2004 Member # 26504 Location: Fruitland MO Posts: 371	Yeah I have a motorsports harness...the only codes it throws are canister and EGR, both of which are not on there. I thought it might be compensating for the compressioni, stroke, and cam selection. I will have to check that module tonight..thanks __________________ If you have a mullet and play video games, your not tellin me shit 68 F350 CC project 72 F350 CC for parts 79 F150 with tons on coils 88 F350 truggy 90 F350 beater truck 96 F250 CC DD

07-25-2005, 02:30 PM	#4 (permalink)
Bluebeast393cid Registered User Join Date: Apr 2004 Member # 29382 Location: Why Not Minot Posts: 88	has it done this before or have you just installed the engine? if just installed you may need to stick a resistor in the EGR plug to make the computer think that it is operating correctly __________________ 90 Bko 393W/E4OD/BW1356 60/14 4.10s 4D2s

07-25-2005, 05:32 PM	#5 (permalink)
MXPAZ Registered User Join Date: Jan 2002 Member # 9377 Location: KC Posts: 139	Mine does that when I have the idle too high. It acts like the computer is trying to lower the idle, but it cant because I have it idled up. Turned idle down and it stopped. __________________ 74 Bronco 351W C6 203-205 ARB 4 wheel disk 3 link . 38.5 TSL SX Super Swampers

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