would 2 degrees on timing make that much difference?
Thread Starter
Melting Slicks
Joined: Jun 2005
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From: Arkansas
would 2 degrees on timing make that much difference?
Hey all,
I have my timing set at 8 degrees BTC and all the guys on the TPI C4 tech says thiers is set at 6 degrees BTC ....I haven't had to go out and re-set mine yet. It's a 90-92 TPI swap.
I was curious if 2 degrees would make any difference?
I have my timing set at 8 degrees BTC and all the guys on the TPI C4 tech says thiers is set at 6 degrees BTC ....I haven't had to go out and re-set mine yet. It's a 90-92 TPI swap.
I was curious if 2 degrees would make any difference?
Advanced
Joined: Oct 2006
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Re: Timing
Timing made all the difference on my car. It refused to start when it was warm and was sluggish. I advanced the initial timing 2 degrees and
it was like a new car! Starts fine now and way more power.
Try advancing the timing (back off if you get engine knock).
Mike
it was like a new car! Starts fine now and way more power.
Try advancing the timing (back off if you get engine knock).
Mike
Thread Starter
Melting Slicks
Joined: Jun 2005
Posts: 2,938
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From: Arkansas
Yeah my car has a slight miss and the engine seems to be shaking more for some reason. Headlight doors shaking and everything, sounds like a little knocking as well. At a stoplight sunday I noticed it would try to idle waaay low 300 rpm or so. Not to forget the "jerking" at cruisng speeds. Something doesn't seem right. I''l try advancing the timing and I'm changing the plug wires too.
Le Mans Master
Joined: Jul 2005
Posts: 5,752
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From: Austin Texas
If you are still running TBI, the E.C.M. sets the idle speed at 600 rpm. For proper operation, do not deviate from OEM timing recommendations. It sounds like you have tuning issues other than timing, IMO.
Thread Starter
Melting Slicks
Joined: Jun 2005
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From: Arkansas
Le Mans Master
Joined: Jul 2005
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From: Austin Texas
Tuning issues can be vacuum leaks, bad plugs or wires, clogged EGR ports/valve, worn throttle shafts, stuck or worn IAC motors, sensors out of spec., etc. Look at all the basics before going any further.
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From: At my Bar drinking and wrenching in Lafayette Colorado
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Thread Starter
Melting Slicks
Joined: Jun 2005
Posts: 2,938
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From: Arkansas
I've done replaced the distributor, coil, plugs, cap, rotor...and now I'm down to the plug wires, the one's I used with my carb set-up were brand new "cut to fit" accel brand.
I ordered a set of ac delco wires a few days ago....going to try them next.
all of my sensors are new, fuel pump is new, injectors are freshly rebuilt.
I did put a vacuum guage on my engine at idle and it shows a "flicker" between 19 - 18 on the guage....which I think ment a ignition problem.
Kinda at a loss right now....
Thread Starter
Melting Slicks
Joined: Jun 2005
Posts: 2,938
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From: Arkansas
I have one of those push in breathers on my valve cover on the driver's side instead of a PVC valve, do you think that could be causing my problems? The spot in the manifold where the hose would go is capped off.
Thread Starter
Melting Slicks
Joined: Jun 2005
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From: Arkansas
Le Mans Master
Joined: Jul 2005
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From: Austin Texas
May not help your situation, but you must hook up that pcv.
Racer
Joined: Feb 2000
Posts: 267
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From: Kelowna, B.C. Canada
your timing should set at 0 (zero degress)
or your chip needs to be changed to what you have the car set to.
right now your chip timing and actual car timing are not the same.
Thread Starter
Melting Slicks
Joined: Jun 2005
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From: Arkansas
So when I time it, I need to unhook the connector, using my light set the timing to 6 degree's BTDC and once everything is buttoned up, the computer will advance it to 0? Just wanted to make sure I understand before I contact the guy that made my chip. Thanks again!
Le Mans Master
Joined: Jul 2005
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From: Austin Texas
Set it to 6* btdc (with bypass connector apart). Shut engine down, re-connect bypass and restart engine. Timing at idle should be between 20* and 28*.
Racer
Joined: Feb 2000
Posts: 267
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From: Kelowna, B.C. Canada
I should have been more clear on this.
what is the timing set at in your chip?
the chip timing and your dist. have to be the same
unhook est wire. read timing with the timing light. set the dist. to match chip. connect est wire and let the computer do the rest.
computer timing for a stock 82 vette is 0
If you can tell me what computer that you are using then I may be able to get the "intial spark advance" from the prom.
what is the timing set at in your chip?
the chip timing and your dist. have to be the same
unhook est wire. read timing with the timing light. set the dist. to match chip. connect est wire and let the computer do the rest.
computer timing for a stock 82 vette is 0
If you can tell me what computer that you are using then I may be able to get the "intial spark advance" from the prom.
Thread Starter
Melting Slicks
Joined: Jun 2005
Posts: 2,938
Likes: 2
From: Arkansas
I should have been more clear on this.
what is the timing set at in your chip?
the chip timing and your dist. have to be the same
unhook est wire. read timing with the timing light. set the dist. to match chip. connect est wire and let the computer do the rest.
computer timing for a stock 82 vette is 0
If you can tell me what computer that you are using then I may be able to get the "intial spark advance" from the prom.
what is the timing set at in your chip?
the chip timing and your dist. have to be the same
unhook est wire. read timing with the timing light. set the dist. to match chip. connect est wire and let the computer do the rest.
computer timing for a stock 82 vette is 0
If you can tell me what computer that you are using then I may be able to get the "intial spark advance" from the prom.
I've been warming the engine up, unhooking the connector, setting the timing at 6 degrees BTDC and reconnecting the connector and going from there....I may have been doing it wrong.....
Thanks again for the help!
Last edited by 1982CorvetteDude; Jun 13, 2007 at 07:57 PM.
Thread Starter
Melting Slicks
Joined: Jun 2005
Posts: 2,938
Likes: 2
From: Arkansas
My timing with the connector unhooked is 6 btdc and after I reconnect the connector it advances to 8* after top dead center.
Plus the smoke is burning my eyes....does that mean it's running rich??
Please help