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1983 Pontiac Trans Am 83

Tiny
SHARPTON2016
  • MEMBER
  • 1983 PONTIAC TRANS AM
Hi,
I have a 83 Pontiac Trans Am with 5.0 (Cross Fire Injection) that starts then stalls immediately unless I give it gas. Has power, spark, no air leaks, fuel pressure is at spec, and there is NO check engine light. Checked IAC Valves and passageway appeared normal. Did no resistance check though. I did nothing to ignition timing can't find timing marks down below. What should be the next step I should take?
Thank you
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Thursday, July 24th, 2014 AT 8:36 PM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for a vacuum leak below tbi units and clean iac holes then check wires leading to tbi an dsee if they are connected ok.
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Friday, July 25th, 2014 AT 6:30 AM
Tiny
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I already checked for vacuum leaks with vacuum tester. I already cleaned IAC ports. TBI wiring is all connected. Anything else I'm missing?
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Friday, July 25th, 2014 AT 7:15 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Other than a distributor issue and or incorrect timing I can't think of much at all. The tbi units have to be synchronized with each other which is included in pics they are small but best I can do. It shows how to do it in pics. Normally this is done only if one of them has been off. Also check pickup coil for resistnce 500-1500 ohms and the wires may be broken from age/wear so twirl them around while checking. You have to remove brown/black wire on passenger side if I remember right to set timing.
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Saturday, July 26th, 2014 AT 6:11 AM
Tiny
SHARPTON2016
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  • 4 POSTS
Thanks for responding. I don't think it could be the distributor cause I used a timing light on all wires. Every spark plug wire made the timing light light up. Ignition timing could be it, the pic you sent with the engine shown with the timing mark tab I don't have on the engine(There is no tab with marks for me to know what to set it at). There might be a different style of timing marks, maybe covered in road grime. Yes you are correct it is a brown/black wire that must be unconnected before timing is set. I'll keep looking.
Thanks for sharing information with me.
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Monday, July 28th, 2014 AT 6:58 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If you don'thave a timing mark that's a chevy and can be purchased at most autparts store as they bolt to the timing cover. Fro what you had said that fuel is to spec it is at 9-13 psi at both tbi units I'm assuming. Normally these things leaked at back or front at base If it 's getting electric and then it' has to be a fuel problem
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Monday, July 28th, 2014 AT 7:09 AM
Tiny
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I found the ignition timing tab, it was tucked in looking behind water pump from top view. Yes fuel pressure is at spec. I did just notice that the driver side throttle body's intake manifold hole has either water of fuel down in it. Tried to siphon out what it could be but the venturi is in the way. May have to get smaller siphon hoses.
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Monday, July 28th, 2014 AT 10:57 AM

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