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| 2.8l timing procedure? (Page 1/3) |
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Harold James Kie
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FEB 09, 04:41 PM
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I know it has been covered before but I could not find in the archives the subject of proper timing and timing procedure for the 2.8l V6. I timed the engine the usual way - bring number one cylinder to TDC and align the marks on the pulley, jumper the A & B connections on the ALCL and shoot it with the timing light. I advanced it to get it to pass smog and the idle stayed at about 900 rpm. I disconnected the battery to clear any codes (there were none) and then drove the car to get the memory to get things right once again such as the idle speed. I read where it is best to time it from the coil wire, not number one plug wire, and if so what degree of advance should I settle it at and what should the idle speed be? Is it necessary to jumper the ALCL? I appreciate the input from everyone who has an educated and experienced answer and I want to say thanks well in advance.
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TopNotch
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FEB 09, 04:56 PM
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fierohoho
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FEB 09, 05:31 PM
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A shortcut to what TopNotch posted would be to put the timing light pickup on the coil wire at the distributor, that way you see both 1 and 4 firing as the engine runs and adjust the timing marks by turning the distributor until they are equal on either side of the 10 degree mark.
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fierofool
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FEB 09, 06:53 PM
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If you put the pickup on the coil wire, you will see all 6 cylinders. I've clamped 1 and 4 plug wires at the same time to do what you're suggesting. You may have to find a wire from another car if you don't have enough slack to pull them together.
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lateFormula
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FEB 09, 08:33 PM
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You can time all six cylinders by clipping the inductive lead of the timing light to the coil lead. Position on the coil lead is irrelevant. The harmonic balancer on the 2.8 has the timing groove cut wider than the other two grooves on the outer ring which are both 120° away from the primary timing mark. The primary timing groove on the balancer will show you the timing on cylinders 1 & 4 while the other two smaller grooves will be lit up for cylinders 2, 3, 5 & 6.
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2.5
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FEB 10, 10:09 AM
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"Correct timing for a V6 Fiero is 10 degrees BTDC"
Is that best timing, or can more power be had with more advanced timing?
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Patrick
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FEB 10, 02:15 PM
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| quote | Originally posted by 2.5:
Is that best timing, or can more power be had with more advanced timing?
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It's a compromise between more power and more emissions. Obviously there's a limit to how far advanced the ignition timing can be set before "pinging" will occur, but with all my cars, I time them by ear for power (and for better fuel mileage), and then temporarily back off the timing (to stock specs) for smog testing.[This message has been edited by Patrick (edited 02-10-2014).]
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Boostdreamer
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FEB 10, 07:10 PM
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Automatics are timed in gear. Manuals are not. Find a sidewalk or street curb you can rest against.
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2.5
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FEB 12, 12:50 PM
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| quote | Originally posted by Patrick:
It's a compromise between more power and more emissions. Obviously there's a limit to how far advanced the ignition timing can be set before "pinging" will occur, but with all my cars, I time them by ear for power (and for better fuel mileage), and then temporarily back off the timing (to stock specs) for smog testing.
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Would you happen to know what your degrees are for power on the 2.8 just out of curiosity?
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Patrick
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FEB 12, 06:53 PM
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| quote | Originally posted by 2.5:
Would you happen to know what your degrees are for power on the 2.8 just out of curiosity?
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What works best for my engines won't necessarily work with anyone else's. Ambient temperature, humidity, carbon build-up in the combustion chambers, octane level of gas, EGR function, etc etc all contribute.
I use regular gas in all my Fieros and the EGR is functional on all of them.
My '84 duke 5-spd has the most power with the timing set right at the top of the inscribed scale (whatever reading that is), although the idle quality suffers a bit. I think my '86 GT automatic is timed pretty high as well, but I honestly forget where it is. However, I notice if I try to time my '88 Formula 5-spd more than an extra 4° above factory timing, it sort of surges if I'm in gear with low revs. I haven't worked all the bugs out of this Formula yet, so I'm hoping I can eventually advance the timing more with no surging (and well before it starts pinging).[This message has been edited by Patrick (edited 02-12-2014).]
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