Hesitation...

5.0L_Of_Fury · 10-22-2002, 09:32 AM

in my new 5.0..when its still cold it seems to jerk ands miss between 1500and 1700RPM...sensor? injector? im confused...

any ideas? it just kinda stalls out like its not getting gas or something but I know my pump is on becasue I hear it engage when I start my car...

LX XLR8R · 10-22-2002, 11:19 AM

is your IAB disconted?

5.0L_Of_Fury · 10-22-2002, 04:56 PM

my WHAT?

10-22-2002, 05:55 PM

IAB=Idle Air Bypass valve (someone correct me if I'm wrong)

When is the last time you changed your fuel filter? That's what it sounds like to me!

PKRWUD · 10-22-2002, 06:23 PM

If the problem goes away as the engine warms up, then I agree that it is probably your IAC (Idle Air Control) valve (aka: IAB).

It is about the size of two 35mm film containers, and is mounted to your TB. Remove the 2 wire harness connector, and the 2 bolts (10mm, I believe), and clean it with Brakleen (green can) and some pipe cleaners. After you re-install it, reset your ECM so that it will relearn it's idle settings with a clean IAC.

Take care,
~Chris

5.0L_Of_Fury · 10-23-2002, 11:07 AM

ok gonna get a new feul filter tonight...and how do I reset my ECM?(sorry im dumb

)

PKRWUD · 10-23-2002, 02:01 PM

Disconnect the negative battery cable.

Turn on the headlight switch.

Wait 10 minutes.

Turn off the headlight switch.

Connect the negative battery cable.

The ECM is now reset. You will need to drive it aggressively for 10-15 minutes for it to do a good relearn.

Take care,
~Chris

10-22-2002, 09:32 AM	#1
5.0L_Of_Fury Registered Member Join Date: May 2001 Location: Mayfield,KY,USA Posts: 288	Hesitation... in my new 5.0..when its still cold it seems to jerk ands miss between 1500and 1700RPM...sensor? injector? im confused... any ideas? it just kinda stalls out like its not getting gas or something but I know my pump is on becasue I hear it engage when I start my car... __________________ OLD NAME:4cyl_Of_Fury 1990 LX 5.0 Hatchback K&N,March Ram Air,Strut Tower Brace '93LX Hatchback !FOR SALE No Substitute For Cubic Inches! BURN EM UP fivepointzero@kytnar.org "Give 'Er Hell" "They Call It Minute Rice..Gee Are Those Actually Track Times?" Firemen: We Find 'Em Hot And Leave 'Em Wet" Rice Haters Club Member #23 (GM Ricer Fads) Gotta Love Hatin 'Em CLUTCHES,FUEL PUMP RELAYS,FOUR CYLINDERS

10-22-2002, 11:19 AM	#2
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	is your IAB disconted? __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

10-22-2002, 04:56 PM	#3
5.0L_Of_Fury Registered Member Join Date: May 2001 Location: Mayfield,KY,USA Posts: 288	my WHAT? __________________ OLD NAME:4cyl_Of_Fury 1990 LX 5.0 Hatchback K&N,March Ram Air,Strut Tower Brace '93LX Hatchback !FOR SALE No Substitute For Cubic Inches! BURN EM UP fivepointzero@kytnar.org "Give 'Er Hell" "They Call It Minute Rice..Gee Are Those Actually Track Times?" Firemen: We Find 'Em Hot And Leave 'Em Wet" Rice Haters Club Member #23 (GM Ricer Fads) Gotta Love Hatin 'Em CLUTCHES,FUEL PUMP RELAYS,FOUR CYLINDERS

10-22-2002, 05:55 PM	#4
Simi Stang Guest Posts: n/a	hesitation IAB=Idle Air Bypass valve (someone correct me if I'm wrong) When is the last time you changed your fuel filter? That's what it sounds like to me!

10-22-2002, 06:23 PM	#5
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	If the problem goes away as the engine warms up, then I agree that it is probably your IAC (Idle Air Control) valve (aka: IAB). It is about the size of two 35mm film containers, and is mounted to your TB. Remove the 2 wire harness connector, and the 2 bolts (10mm, I believe), and clean it with Brakleen (green can) and some pipe cleaners. After you re-install it, reset your ECM so that it will relearn it's idle settings with a clean IAC. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

10-23-2002, 11:07 AM	#6
5.0L_Of_Fury Registered Member Join Date: May 2001 Location: Mayfield,KY,USA Posts: 288	ok gonna get a new feul filter tonight...and how do I reset my ECM?(sorry im dumb ) __________________ OLD NAME:4cyl_Of_Fury 1990 LX 5.0 Hatchback K&N,March Ram Air,Strut Tower Brace '93LX Hatchback !FOR SALE No Substitute For Cubic Inches! BURN EM UP fivepointzero@kytnar.org "Give 'Er Hell" "They Call It Minute Rice..Gee Are Those Actually Track Times?" Firemen: We Find 'Em Hot And Leave 'Em Wet" Rice Haters Club Member #23 (GM Ricer Fads) Gotta Love Hatin 'Em CLUTCHES,FUEL PUMP RELAYS,FOUR CYLINDERS

10-23-2002, 02:01 PM	#7
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Disconnect the negative battery cable. Turn on the headlight switch. Wait 10 minutes. Turn off the headlight switch. Connect the negative battery cable. The ECM is now reset. You will need to drive it aggressively for 10-15 minutes for it to do a good relearn. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

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