Question about Chevrolet Suburban 1500

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No power up hills and pinging noises come from TBI little back fire.

I have an 89 chevy suburban with 350 TBI, pinging noises come out of the TBI when accelerate with a little back fire. I've replaced several parts: sparkplugs and wires, ECM Circut, coil, ignition module, cap and rotor, TPS Sensor, Oil Pressure switch. Running out of ideas. Computer codes are now fine. Ran fine a few months ago passed emmisions now I have no horse power when going up hills; loses power.

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  • carhob May 11, 2010

    have u checked timing?

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Your distributer is out of time mine did the same thing.

Posted on Feb 16, 2013

  • stan madison Feb 16, 2013

    your distributer is out of time, mine did the same thing.

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On top of the knock sensor being out it could also be do to too much carbon build up

Posted on Oct 21, 2012

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Sounds like the knock sensor has failed. It's on the passenger side at the bottom of the engine block, in front of the starter. One wire going to it. Have you checked the timing lately, maybe it has moved?

Posted on Apr 19, 2009

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1 Answer

Have wrecked 1990 1500 v8 what year of truck interchange


if is the TBI 350 (5.7L), anything from about 1989 to 1995 should be alright, give or take a few sensors. i have owned an 89 suburban, a 90 suburban, and a 95 suburban, and the all have the same motor.

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I have a 1994 k2500 suburban with very little tow power.I've done a complete tune up, replaced the fuel filter,Had the trans checked, replaced egr,cat and muffler,good fuel pressure,compression 14


Have you tried to manually downshift the trans going up hills? Sounds like the trans is not being told to downshift .

There is a test machine, (Want to say Odessey) that is attached to your truck and the truck is driven while hooked up. This machine can be asked questions by the mechanic. It has more electronics in it than the onboard computer. You would have the trailer attached to reveal realtime operating conditions.

It basically can do what a Dynamometer can do, while pulling a load. Even if it cost substantially to do this test, you would save by not buying parts you do not need.

Find a Dealer who knows about this type of machine and has one to use on your truck.

Sep 03, 2012 | 1994 Chevrolet Suburban

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1989 chevy 44 engine swap


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Apr 29, 2012 | 1989 Chevrolet Suburban

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1994 Chevy full-size Blazer with 5.7 Liter 350 T.B.I. backfires and loses power when going uphill. The vehicle has a new motor with less than 3,000 miles on it, but every bolt on part came off of the old...


Was it originaly a 305? If so then the Electronic Spark Control (ESC), PROM and fuel injectors should be changed to 350 stuff.
Any pinging? Check Engine light?
Maybe take the ignitoon module out and have it tested at an Auto Zone. Without being able to do a hands on diag I am guessing maybe an issue with spark advance when under a load.

Another guess would be a low tank of fuel on a steep hill. Could it be starvation?

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94 chevy suburban with 5.7. New dist cap, rotor, plugs, wires, fuel filter, battery, and last year new ign coil, module, and ecm. I set the timing to 0 at tdc with timing advance unplugged and when I...


sounds like timing is a little late. try a SLIGHT advancement (1-2 degrees) of the timing. keep trying until idle smooths out, listen for pinging on a steep hill in top gear. if engine pings at all other than at full throttle, timing is too far advanced. hope this helps. good luck.

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Firing order for 1996 gmc suburban 350 engine w/air


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My 89 chevy is making a knocking sound i just replaced lifters,push rods rocker arms timing chain and gears cam and valve springs and umbrella seals. i have no clue what it could be except mabe the timing


Did you check the knock sensor located on the passenger side of the block, behind the starter, The sensor can be bad sending a signal to the Computer causing the computer to readjust the spark advanced timing causing Knocking and pinging....... or it could be as simple as bad gas. If you changed the timing chain, the gears should both be set with the the timing marks at 12 oclock for the 89 chevy K1500 5.7 350 V8 TBI OHV 16V if you set the timing at 12 oclock on the cam and 6 oclock for the valve and Distr. the number 6 is firing as number 1 you can recheck by bringing the No. 1 piston back up to TDC and check to see if your Distr. is pointing to the No. 1 Plug Hope this helps

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1 Answer

89 suburban back fires through the throttle body mainly when it's cold. Also hear a little knocking noise through trottle boby. Seems to lack power. I've changed several parts: fuel pump, oil sensor...


Check the timing chain..Take the belt of and turn the crank by hand and see how much slop there is when you turn it back and forth..If theres not much then there could be a cam problem.But most of the time its the timing chain..Hope this helps you and have a great night....

Apr 03, 2009 | 1989 Chevrolet Suburban

1 Answer

Where is fuel filter on 89 chevy suburban?


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Jan 10, 2009 | 1989 Chevrolet Suburban

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