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1993 Ford Thunderbird 93 V6 3.8 Supercharged

Tiny
BEALE120
  • MEMBER
  • 1993 FORD THUNDERBIRD
  • 3.8L
  • V6
  • RWD
  • AUTOMATIC
  • 53,000 MILES
Hello 2 Car Pros,

Been having quick intermittent check engine problems (while driving, then disappears, never been quick enough to grab the code) with the Thunderbird for years after a tornado incident in 1999 (Carport fell on top of car and damaged the rooftop and sails.) Car was restored after.

Car will stall sometimes from park to gear and reverse (RPM drops to 300 then stalls). Car taken to professional years ago and never fixed. He replaced all common sensors and spark plugs that can cause this problem(The professional never gaped the plugs properly). Recently I cleaned IAC Valve(Passed resistance check) and throttle body, and changed spark plugs (Noticed the plugs looked like some carbon buildup must be running rich). I just thought I would mention this. Don't know much about the systems of the car. Also we had a 01 Dodge Viper with the same exact problem that we sold because of this problem that no one could fix.

Do you have the ECM pinout diagram for the car? And also the diagram that includes the primary electrical systems that run off the ECM?

I really do appreciate this!
Eric
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Wednesday, April 16th, 2014 AT 6:18 PM

10 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Our diagrams would be to small to see ofor ecm things but check your fuel pressure with a gauge as that may cause it. A manual would be better for the application you want.
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Thursday, April 17th, 2014 AT 7:09 AM
Tiny
BEALE120
  • MEMBER
  • 23 POSTS
Hey,

Weeks ago I checked the fuel pressure and did a leak down test, which the pressure is within specs. It's been running fine recently after a few minor changes, but at anytime it can do this stalling problem it's been doing for years. Do you think a Cam sensor can be responsible for doing this?

The diagrams you have for PCM pinout and loads that work off of PCM would be a big help in helping me diagnose this. I understand there are small lettered pictures but I can try to increase photo size. I looked at the diagrams online at autozone. Com and nothing matches from both pinout and the other diagrams. I don't know if it's because this car is a supercharer.

I want to thank you!

Eric
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Thursday, April 17th, 2014 AT 7:16 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I doubt it's what you think it is if it were a cam sensor it wold throw a code, try cleaning throttle plate with chokecleaner onboth sides an diac hole then check for vacuum leaks like soft hosescracks etc. Also check for a clogged egr.
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Friday, April 18th, 2014 AT 6:37 AM
Tiny
BEALE120
  • MEMBER
  • 23 POSTS
This car is not equipped with an EGR valve, according to the emissions chart. Again, the tachometer drops to 300 rpm under load and doesn't recover(stalls). It's not fuel, air or vacuum leaks, spark is all that's left. It's running rich. This is what I'm saying about needing the diagrams. I won't know what the system has electronically without them. It's really hard to tell what is equipped with the car because everything is tucked behind the engine very well and hard to see. I have cleaned the throttle plate already along with IAC valve and changed spark plugs. There are no collapsed or deteriorated hoses that I see. I have checked vacuum with gauge, it's normal. The point is I need diagrams, can you supply them to me or not? Any other help would be greatly appreciated. This has been going on for too long, I'm running out of options!
Thanks
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Friday, April 18th, 2014 AT 7:53 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
As I said in very first reply that the diagrams are to small for you to see and you can't get them to go larger. If you want that get a manual. What is fuel pressure key on engine off should 30-45 with engine running 30-40 psi checked with a gauge. It should hold there for a few minutes if it's running rich it may be off like to high. Scan for codes which i'd bet you haven't done look under obd1 on trouble codes on site here. If you dont' scan it first and try to get a freeze frame if you can.
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Saturday, April 19th, 2014 AT 6:08 AM
Tiny
BEALE120
  • MEMBER
  • 23 POSTS
You mentioned about fuel pressure, again I mentioned above that I have checked the fuel pressure. At rest it's around 30-40 psi, running 32 psi and 10 minutes after shut off the pressure is 38-42 psi. Is this acceptable?

You said "It should hold there for a few minutes if it's running rich it may be off like to high" Can you be more specific on what you mean by that?
As far as the check engine code there is none at the moment. It only comes on once in a while and then goes off. I don't think I could check an engine code if there isn't any that appears on the dash other than a system is clear code.

I'm not sure what you mean about a freeze frame, what is that all about?

Thanks bud

Eric
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Saturday, April 19th, 2014 AT 9:20 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It means that he fuel pressure should be with in the specified range not higher as it will cause to run rich and freeze frame is something that is done with a scanner to pickup things like your check engine light going off when you say you have scanned and can't see a code. A pro knows what this is, but you being a novice wouldn't understand the figures given in freeze frame because you don't do it all the time so really a pro needs to scan it.
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Sunday, April 20th, 2014 AT 5:51 AM
Tiny
BEALE120
  • MEMBER
  • 23 POSTS
Hey,

Today I used a jumper wire on the EEC test connector and seen if I would receive any codes. All I got was a code 11 which system has no codes. I seen online there is an extra tool you can buy that you use to receive any codes that are still stored in the computers memory while you are using the jumper wires. Do you know what I'm talking about? If you do, where can you purchase one of these tools?

And plus a pro had this car in his garage for 1 year and could not figure it out. Whether he freeze framed it or not he still did not fix it!

Thanks
Eric
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Sunday, April 20th, 2014 AT 9:29 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You have the old obd1 system on your car I dont' know where you can pickup that tool maybe online. I can offer no further suggestions as I cannot see it nor check things myself that I would normally. There are two different ignition systems on this car which can cause some of your problem but like I said ican offer no further suggestions
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Sunday, April 20th, 2014 AT 9:44 AM
Tiny
BEALE120
  • MEMBER
  • 23 POSTS
Do you know what the tool is called? Where can I find a dirt cheap shop manual for this car? I've been looking and I found a manual but not sure if it contains info on supercharged model.

Eric
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Monday, April 21st, 2014 AT 5:11 PM

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