89 454 tbi driveability Q - Pirate4x4.Com : 4x4 and Off-Road Forum

fj40mon · 10-09-2001, 10:10 PM

I have a 89 1 ton 4x4 chev that I use for towing my fj40. I've been having trouble with the engine.I has no wear near the power it had in the past and it has a terrible miss. When I step on the go pedal it falls on its face like a bad accelerator pump on a carb. This a 454 tbi. I scanned it (snap on scanner) I came up with a code 44 sustained lean condition. It does feel like its not getting enough fuel.

Replaced the egr because I heard they were very troublsome. Didnt help at all.

Any suggestions?

Thanx in advance

Shaun

u2slow · 10-09-2001, 10:28 PM

O2 sensor?

hy_desert_4wheeler · 10-10-2001, 03:20 AM

Try the throttle position sensor.When they go bad they will act like a bad accelerator pump.

Norm · 10-10-2001, 11:10 AM

Check your fuel pressure also. A clogged filter or bad pump could cause those symptons. I think it needs to be close to 13PSI

The Rockslut · 10-10-2001, 11:29 AM

Quote:

Originally posted by Norm:
<STRONG>Check your fuel pressure also. A clogged filter or bad pump could cause those symptons. I think it needs to be close to 13PSI</STRONG>

I would bet a large some of money that the fuel filter is plugged solid. Its amazing how little fuel they will run on.

KacksterK5 · 10-11-2001, 07:30 AM

Does the service engine soon light come on and then go back off while driving? GEt new O2 sensor first

fj40mon · 10-11-2001, 09:35 AM

I replaced the o2 with no luck. I want to check the fuel pressure but I dont see a fitting to put a guage on. Are they hidden somewhere or do I have to connect it in line somehow?

Thank you guys,

Shaun

10-09-2001, 10:10 PM	#1 (permalink)
fj40mon Registered User Join Date: Mar 2001 Member # 3929 Location: longview,WA. Posts: 170	89 454 tbi driveability Q I have a 89 1 ton 4x4 chev that I use for towing my fj40. I've been having trouble with the engine.I has no wear near the power it had in the past and it has a terrible miss. When I step on the go pedal it falls on its face like a bad accelerator pump on a carb. This a 454 tbi. I scanned it (snap on scanner) I came up with a code 44 sustained lean condition. It does feel like its not getting enough fuel. Replaced the egr because I heard they were very troublsome. Didnt help at all. Any suggestions? Thanx in advance Shaun

10-09-2001, 10:28 PM	#2 (permalink)
u2slow Registered User Join Date: Apr 2001 Member # 4243 Location: Salt Spring Island, BC Posts: 3,067	O2 sensor? __________________ 90-93 CTD jalopies

10-10-2001, 03:20 AM	#3 (permalink)
hy_desert_4wheeler Registered User Join Date: Jan 2001 Member # 2790 Location: Stinnett Tx USA Posts: 1,629	Try the throttle position sensor.When they go bad they will act like a bad accelerator pump. __________________ Russ hy_desert_4wheeler 46 Dodge WC15--67 M715--85 Jeep CJ10A--06 Dodge Ram2500Quad cab Cummins--94 Suburban--06 Ridgeline-

10-10-2001, 11:10 AM	#4 (permalink)
Norm Poor White Trash Join Date: Apr 2001 Member # 4387 Location: Kalispell, MT Posts: 1,865	Check your fuel pressure also. A clogged filter or bad pump could cause those symptons. I think it needs to be close to 13PSI __________________ "My Border Collie is smarter than our president"

10-11-2001, 07:30 AM	#6 (permalink)
KacksterK5 Rock God Join Date: Jul 2001 Member # 5851 Location: Harford County, MD Posts: 1,418	Does the service engine soon light come on and then go back off while driving? GEt new O2 sensor first __________________ "If you ain't first, you're last" 86 4Raisin A bunch of stuff under it 02 Chevy 2500 HD Tow Rig

10-11-2001, 09:35 AM	#7 (permalink)
fj40mon Registered User Join Date: Mar 2001 Member # 3929 Location: longview,WA. Posts: 170	I replaced the o2 with no luck. I want to check the fuel pressure but I dont see a fitting to put a guage on. Are they hidden somewhere or do I have to connect it in line somehow? Thank you guys, Shaun

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