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hot start timing

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Old 03-04-2008 | 07:18 AM
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mxcrazed's Avatar
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From: eastern mass
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
hot start timing

now i am beginning to understand that less timing will help reduce piston knock i am currently at 16* at idol will that also help hot starts I am finally selling my jeep and registering my Firebird today!
Old 03-04-2008 | 11:11 PM
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mxcrazed's Avatar
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From: eastern mass
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: hot start timing

so today i install the interior and hit the road for the first time and guess what i kill the engine and with about 4* of initial timing and after i killed the engine it cranked until the battery was low which was 7 or 8 times then then some one jumped me and it kicked right over what is that all about? why wouldn't it have turned over the first couple of cranks when it was strong?
Old 03-07-2008 | 08:24 PM
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From: Arab, Alabama
Car: 1988 Trans Am GTA
Engine: 350 4BBL
Transmission: 700R4
Axle/Gears: 3.27
Re: hot start timing

Originally Posted by mxcrazed
so today i install the interior and hit the road for the first time and guess what i kill the engine and with about 4* of initial timing and after i killed the engine it cranked until the battery was low which was 7 or 8 times then then some one jumped me and it kicked right over what is that all about? why wouldn't it have turned over the first couple of cranks when it was strong?
Do you have a vacuum advance distributor in it?
Old 03-10-2008 | 12:10 AM
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mxcrazed's Avatar
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From: eastern mass
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: hot start timing

wow I am sorry that I missed a response to my own post! No I don't have a vacuum advance I still have the stock dissy on there. I set the timing back to 5* and put an accel super coil on there I also have charged the battery thoroughly at this point and I haven't had any problems yet. Now that it has stopped raining here in mass I can enjoy my car, although it is still below freezing.
Old 03-10-2008 | 04:45 PM
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Supervisor42's Avatar
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Joined: Jul 2005
Posts: 1,675
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From: Arab, Alabama
Car: 1988 Trans Am GTA
Engine: 350 4BBL
Transmission: 700R4
Axle/Gears: 3.27
Re: hot start timing

Originally Posted by mxcrazed
...No I don't have a vacuum advance I still have the stock dissy on there...
The problem is the ECM controls the timing advance with the stock distributor. It needs all of the inputs and outputs functioning in order to stay out of "limp-home" mode.
If the CC Qjet was removed (stock on '87 LG4), the ECM is missing the TPS input as well as the mixture control output to run in closed-loop operation.
If enough stuff is messed up and it can't control the engine, it enters "limp-home" mode which locks the timing in a narrow range.
If you're going to run a non-cc carb, you will have to get a dizzy that doesn't use the ECM to control the timing.
Old 03-11-2008 | 09:21 PM
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mxcrazed's Avatar
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From: eastern mass
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: hot start timing

thank you I happen to have one lying around and I guess I'll see if I can get it into operable condition. What about my knock sensor once the oem dissy has been removed?
Old 03-12-2008 | 09:46 PM
  #7  
Supervisor42's Avatar
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Joined: Jul 2005
Posts: 1,675
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From: Arab, Alabama
Car: 1988 Trans Am GTA
Engine: 350 4BBL
Transmission: 700R4
Axle/Gears: 3.27
Re: hot start timing

Originally Posted by mxcrazed
... What about my knock sensor once the oem dissy has been removed?
It's been ignored in "limp-home" mode anyway. (ie: not doing anything)
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