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Old 12-04-2010, 08:09 AM   #1
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Car: 1986 Trans am
Engine: 305 TPI
Transmission: 700r4

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86 trans am help needed wont turn over

well it started out stalling at low idles it would get to around 650 rpms in gear when coasting or stopping and it would stall out.It seemed to be burning more gas than normal also and sometimes it would only stay running from a cold start with some pressure on the pedal but once it warmed up a little it would run ok then the stalling would start
it didnt ever have the ses light on

then yesterday i went into a store and came out and it wouldnt turn over at all

dont know if this helps but the 4 plug wires on the right side of the motor felt really hot after running it for a while and the ones on the left side stayed cool.

where should i start
thanks
tom
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Old 12-04-2010, 02:11 PM   #2
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Re: 86 trans am help needed wont turn over

Does the engine not turn over (no cranking) or does the starter operate and the engine does not fire? Big difference.
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Old 12-05-2010, 03:33 PM   #3
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Re: 86 trans am help needed wont turn over

does not fire
thanks
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Old 12-05-2010, 09:34 PM   #4
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Re: 86 trans am help needed wont turn over

did u check for fuel pressure? did u see if it has spark?
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Old 12-10-2010, 04:04 PM   #5
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Re: 86 trans am help needed wont turn over

not yet how do you check fuel pressure and spark sorry i am a newbie..
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Old 12-10-2010, 04:08 PM   #6
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Re: 86 trans am help needed wont turn over

to check for fuel pressure u can locate the schrader valve on the fuel rail but u will need a fuel pressure gauge to get the exact psi reading

to check for spark u need an inline spark tester that would go between the plug wire and plug or u could put it between plug wire and distributor cap
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Old 12-10-2010, 06:52 PM   #7
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Re: 86 trans am help needed wont turn over

I have spark I replaced the ignition module and the coil still wont turn over. I hear the fuel pump turn on i will get a fuel pressure gauge tomorrow, i sprayed it with starting fluid in the throttle bottle and it kicked over real rough, i think the timing is off though.
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Old 12-10-2010, 09:27 PM   #8
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Car: 1988 IROC
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Re: 86 trans am help needed wont turn over

Quote:
Originally Posted by tnkc1009 View Post
I have spark I replaced the ignition module and the coil still wont turn over. I hear the fuel pump turn on i will get a fuel pressure gauge tomorrow, i sprayed it with starting fluid in the throttle bottle and it kicked over real rough, i think the timing is off though.
Bring the engine to TDC, take the dizzy cap off and make sure the rotor is pointing at the post for the number one cylinder, this will allow the car to start if the timing is way jacked up, it will be '0' BTDC, put it back together. If it still doesn't fire you may need to jump your fuel pump. There is a port in the OBD 1 diagnostic port that you will have to run a wire from the port to an ignition hot in the fuse box. This will insure the pump keeps running more than the few seconds it primes. If the car still does not start it is a safe bet the injectors are not firing. Was there a yellowish dust/residue when you replaced the module? If so your pickup coil is most likely shot which will not give the appropriate signal to the module to fire the coil.

The pickup is under the reluctor in the dizzy (reluctor is pointy thing under the rotor)
http://shop.advanceautoparts.com/web...S_347908427___

http://shop.advanceautoparts.com/web...1582566243___#


This explains the procedure even though it is for a Fiero, gives you the basics
http://www.fierofocus.com/articles/tt-pickupcoil.html

Easier to buy a remanned dizzy

let me know what you come up with

Last edited by IROCmenace; 12-10-2010 at 09:29 PM. Reason: jumped ahead
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Old 12-11-2010, 06:27 AM   #9
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Re: 86 trans am help needed wont turn over

no dust just very brittle connectors.and my mistake I replaced the rotor not the coil, How do I bring the engine to tdc. Also I noticed the dizzy will turn by hand with little resistance is this normal. I am sure after tinkering with it the timing is all jacked up.If my timing chain went would I still be getting spark?
Thanks for the response.....
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Old 12-12-2010, 12:40 AM   #10
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Re: 86 trans am help needed wont turn over

No problem, glad to help
You would still get spark if the timing chain went put I would doubt that went without you have other serious problems

Sounds like the dizzy hold down clamp is loose, 1 bolt holds a large c clip that holds the dizzy down.

to bring the motor to TDC there are a couple different ways.
With the dizzy cap off, turn the crank with a wrench by hand. It is easier if you take off the belts. The cylinder reaches TDC twice in a cycle. You need it on the compression stroke. With the dizzy cap off but rotor on consider the firewall the 12 o'clock position, when the rotor is around the 5 o'clock position look at your timing marker, the 0 degree mark should be close to the line on the harmonic balancer. Get the mark on 0 degress at the timing marker

Now put the cap back on, loosen the dizzy hold down clamp, line up the closest post on the cap to where the rotor is pointing at it. hook up that post to your number 1 cylinder plug wire. Then snug the dizzy hold down clamp. Attach all the other plug wires in the correct firing order (any $15 manual will have the firing order and cylinder numbers)

Then if it still doesn't start you have other problems. You probably need to have your ignition module checked at a parts store to make sure it is working. If it is or isn't good make sure you put the dilectric grease on the mounting pad on installation

Last edited by IROCmenace; 12-12-2010 at 12:46 AM. Reason: mo info
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Old 12-12-2010, 09:53 AM   #11
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Re: 86 trans am help needed wont turn over

firing order of most small blocks is 18436572
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Old 12-19-2010, 12:37 AM   #12
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Re: 86 trans am help needed wont turn over

Ever get it to start?
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Old 01-08-2011, 03:56 PM   #13
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Re: 86 trans am help needed wont turn over

jjust changed the fuel pump today what a nightmare it starts now but real ruff I think I messed up thr timing when changing the ignition module now I think I will bring it to a shop to finish off now that the hard job is done
Thanks To all For the help
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Old 01-08-2011, 03:56 PM
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