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#1
12-03-2009, 01:09 AM
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89 5.7 timing
I have a 1989 chevy 4X4 I have tried to set the timing by disconecting the tan wire and setting time at 0 turn off motor reconect tan wire disconect ground to clear computer reconect start motor and it backfires through intake tried to drive it and the exhaust manifolds started glowing if I set the timing to were it runs descent it is way out there
I installed the motor and think I stabbed distributer right as it does run ok just wont pass smog till I fix this problm 
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#2
12-03-2009, 01:28 AM
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Re: 89 5.7 timing
turn the distributor 180 degrees and try it. It sounds to me like it is 180 off.
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#3
12-03-2009, 09:39 AM
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Re: 89 5.7 timing
Quote:
If 180 out it will not run.
__________________
Remember proper testing gives us the answer to many problems. MT
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#4
12-03-2009, 09:43 AM
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Re: 89 5.7 timing
Any codes?
Make sure you are using right timing mark.some have two sets. Check no piston for top dead center on compression stroke with time mark at 0 degrees. Back fire sounds like a cross fire. Double cehck firing order and cap and rotor and plug wires.
__________________
Remember proper testing gives us the answer to many problems. MT
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#5
12-03-2009, 10:58 AM
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Re: 89 5.7 timing
No the truck runs fine just cant bring the timing down to were it is supposed to be the backfiring is when you romp on the throttle also it loses alot of power so I have to set it at Im guessing 18 dgrees or so to run right but that is making my idle high and my fuel millage is terrible
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#6
12-03-2009, 11:22 AM
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Re: 89 5.7 timing
Is dist set right?
No 1 piston on TDC compression and dist rotor to no 1 cylinder? And the timing marks at 0 tdc And bypass wire unpluged? If so and the right timing mark you should be able to adjust it down to 0 degrees. Any check engine lights?
__________________
Remember proper testing gives us the answer to many problems. MT
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#7
12-03-2009, 03:51 PM
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Re: 89 5.7 timing
I figurd I set the distributer right can 1 tooth off allow it to run good but not allow you to set the timing at the right setting
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#8
12-03-2009, 04:00 PM
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Re: 89 5.7 timing
Quote:
No 1 piston TDC compression stroke point the rotor to no 1 plug wire. Make sure piston is on compression stroke AND WHEN IT HITS tdc and and timing marks are right SET THE DIST ROTOR TO NO 1 PLUG WIRE. Let us know how it goes.
__________________
Remember proper testing gives us the answer to many problems. MT
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#9
12-03-2009, 05:22 PM
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Re: 89 5.7 timing
I wonder if the harmonic balancer has shifted. The rubber can deteriorate. If the #1 piston is moved to TDC on the compression stroke is the timing mark even close to 0?
//2000CAYukon
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#10
12-05-2009, 06:47 AM
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Re: 89 5.7 timing
I think it is the harmonic balancer too because I stabbed dist again made sure TDC I have set distributors many times just this time I over thought it I guess but one last question the wire you disconect I have been disconecting a purple wire thats at back of the motor only one that is able to disconect and looks like other conectors I have disconected to do timing in the past but I am told it is supposed to be a tan wire with black stripe if so were is it was told behind glove box anyone know for sure
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#11
12-05-2009, 09:56 AM
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Re: 89 5.7 timing
At no 1 TDC the timing marks on pulley should be at 0 degrees.
The book says near dist on the single wire tan/black wire connector. I have found them taped to wiring harness under the plastic cover on firewall in front of heater core. Also I have found it under edge of carpet under heater box inside cab and some behind and under glove box.
__________________
Remember proper testing gives us the answer to many problems. MT
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#12
12-05-2009, 11:06 AM
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Re: 89 5.7 timing
Where was the tan wire you were disconnecting? I remember there being an O2 wire near the distributor that was tan and when disconnected would not allow you to time it. Made that mistake before. (why the F wont this truck let me time down to 0 degrees?), turns out I was unplugging a wire to the O2 sensor rather than the timing wire! Found the right wire, and went well from there on out. The base timing wire, when disconnected, will completly change the idle of the pickup. It will sound like a completly different motor. Thats how you know you have found the right wire.
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-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#13
12-07-2009, 06:13 PM
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Re: 89 5.7 timing
Thanks for all the reply But I was disconecting wrong wire was told the torq lockup anyways found the wire hiding deeper in the loom finally got it to set timing were I wanted it
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#14
12-07-2009, 06:26 PM
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Re: 89 5.7 timing
Quote:
Was it on or taped to the wiring lome on firewall in front of heater core?
__________________
Remember proper testing gives us the answer to many problems. MT
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