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04-16-2012, 10:44 PM
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#1 |
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Registered User
Join Date: Mar 2012
Location: Toano , VA
Posts: 96
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1990 k5 blazer TBI help
i have had the worst luck with the old tbi motors i would love to rip it out and go to a carb lol but besides that i want to stay with how it came.now my blazer idles great runs pretty good but has a slight miss at strange RPMs .it throws the check eng light once in a while and says the O2 sensor in pipe is getting a "lean" reading?> open to any good suggestions? im kind of thinking weak fule pump?thank you
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Chris Heinz |
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04-16-2012, 11:26 PM
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#2 |
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In the Forgotten far North.
 
Join Date: Jul 2007
Location: Anchorage, Alaska
Posts: 2,627
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Re: 1990 k5 blazer TBI help
Idle air control solenoid or throttle position sensor...maybe even the fuel pressure regulator.
Also check for vacuum leaks
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1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade |
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04-22-2012, 07:07 PM
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#3 |
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Registered User
Join Date: Jan 2004
Location: Portage, WI
Posts: 89
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Re: 1990 k5 blazer TBI help
those o2's in the obd1 vehicles weren't known to be the best or the longest living I'd put in a new o2 sensor they're cheap. We used to put a ton of those in!
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Scott 66 chevy short step 327 4speed 67 chevy Short Fleet tpi 350 700r4 72 chevy K10 swb 01 GMC Sierra 01 Pontiac Bonneville |
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04-22-2012, 07:20 PM
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#4 | |
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Registered User
Join Date: Dec 2010
Location: Dallas, TX
Posts: 160
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Re: 1990 k5 blazer TBI help
Quote:
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2010 Basalt Black Porsche Cayenne GTS - Daily driver 1991 2500 Suburban, Black - 454/80E tow monster, soon to go under the knife... Again.  1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac |
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04-24-2012, 05:50 PM
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#5 |
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Registered User
Join Date: Aug 2011
Location: Massachusetts
Posts: 66
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Re: 1990 k5 blazer TBI help
Replace coolant temperature sensor (on top of intake, next to upper radiator hose). Also replace O2 sensor.
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04-25-2012, 02:39 AM
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#6 |
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Registered User
Join Date: Apr 2012
Location: Bentonville, AR
Posts: 14
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Re: 1990 k5 blazer TBI help
My 87 suburban (92 TBI 454) does the same thing. Harrisperformance recommends a heated O2 from a 94+ 4.3. I havnt tried it yet.
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