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i have a 85 ford tbird 3.8liter FI it will start but ...

Sent to Car Experts December 12, 2005 6:12 p.m.

i have a 85 ford tbird 3.8liter FI it will start but once it warms up it quits running. it starts back up after hard cranking but shuts right back off. the fuel pump, oxy sensors, fuel filter, vac lines, gas lines, electric and chassis grounds have all been checked and are all fine.

Optional Information:
1985 Ford thunderbird 3.8 v6

Customer (name blocked for privacy)

Status: Closed Value: $10

Answer
December 12, 2005 6:43 p.m. (31 minutes and 4 seconds later)

ACCEPTED

You are going to have to check for injector pulse,spark and fuel pressure during the failure.Then post with the results and we can go from there.It kind of sounds like a bad crank sensor maybe.

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Reply
Sent December 12, 2005 6:57 p.m. (13 minutes and 28 seconds later)

where is the crank sensor located on 85 tbird or do you mean knock sensor could it also be the fuel pump relay

Customer (name blocked for privacy)

Reply
Sent December 12, 2005 8:49 p.m. (1 hour and 52 minutes later)

Cannot find where the crank sensor would be located on the '85 Thunderbird 3.8 engine, and couldn't find reference to it in the owner's manual or haynes manual.Could that also be the knock sensor, and could the fuel pum relay be part of the problem?

Customer (name blocked for privacy)

Info Request
December 12, 2005 9:14 p.m. (24 minutes and 25 seconds later)

I'm sorry your car uses a pickup coil in the distributor instead.Those systems were famous for bad ignition modules.You still need to check for the above mentioned items.If you are only missing spark the module is the most likely cause.If you are missing injector pulse and spark the pickup coil is number one suspect.The pickup coil does the same thing as a crank sensor on newer engines.

__________________
Master ASE Certified.L1 Advanced Engine Performance Certified.Pa Emission Repair Technician.Just Answer Car Category Mentor.

Davo -- Master technician -- 99% Positive Feedback on 1894 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician

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