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post #1 of 11 (permalink) Old 09-09-2011, 01:20 PM Thread Starter
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87 thunderbird running rough

3.8 automatic, starting running rough about a week ago. lack of power, stumbling under acceleration. new plugs, wires, cap n rotor and coil. just replaced the timing chain, all the timing is set right. now my problem is its shakes pretty bad, and it almost stalls out in gear. it deosnt sound like its missing anymore, so i fixed that problem, im just at a loss for what it could be. any ideas would be appreciated
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post #2 of 11 (permalink) Old 09-09-2011, 01:46 PM
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post #3 of 11 (permalink) Old 09-09-2011, 02:13 PM Thread Starter
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just replaced it a few days ago, its doing better now. i had the wires for cylinders 4 and 5 switched on the dizzy. still feels a little low on power though
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post #4 of 11 (permalink) Old 09-09-2011, 03:48 PM
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87 is a bit older, check your vacuum lines, see if it's throwing any codes.

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post #5 of 11 (permalink) Old 09-10-2011, 11:07 AM Thread Starter
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cant find any vaccuum leaks, last night i noticed its hard to keep running till its warm. still feels like its stumbling a bit even when it warms up
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post #6 of 11 (permalink) Old 09-10-2011, 11:31 AM
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Assume timing 10 deg with spout plug out.
- if the timing dances or jitters, worn dist or bad pickup

Check fuel pressure, open FP Reg vac line.. fuel in it?

Read the plugs.

Disconnect ECT and try

Check TPS. Normal idle speeds at start?


When you checked for vac leaks did you disc IAC first? Makes it a lot easier. Shim Throttle stop if needed to keep running, dont adjust screw.

Disconnect ALL vacuum and plug, EXCEPT FPR. Change?

Watch engine running in dark.. spark jump? If none, THEN...
To find vac leaks use unlit propane torch, engine speed and sound will change assuming IAC disconnected.

Map sensor.. disconnect vac line, see if change


Edited to address procedural safety

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Last edited by pettyfog; 09-10-2011 at 06:50 PM.
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post #7 of 11 (permalink) Old 09-10-2011, 12:38 PM
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Quote:
Originally Posted by pettyfog View Post
To find vac leaks use unlit propane torch, engine speed and sound will change assuming IAC disconnected.

Watch engine running in dark.. spark jump
Reverse those two ... LAST thing to do is to spray unlit propane around a motor that's arcing ...

RwP
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post #8 of 11 (permalink) Old 09-10-2011, 06:00 PM
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Clean the throttle body. Have the fuel injectors ever been cleaned?

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post #9 of 11 (permalink) Old 09-10-2011, 06:46 PM
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Quote:
Originally Posted by RalphP View Post
Reverse those two ... LAST thing to do is to spray unlit propane around a motor that's arcing ...

RwP
Good point.

They were individual thoughts.

I learn more about cars every day!
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post #10 of 11 (permalink) Old 09-13-2011, 11:33 AM Thread Starter
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thanks guys ill try these out. its running decent right now, just a little hard to keep running at first start up when its cold, and it feels like its still a little low on power. would a vac leak seem better once its warmed up?
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post #11 of 11 (permalink) Old 09-13-2011, 11:02 PM
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Quote:
Originally Posted by skitzo545 View Post
thanks guys ill try these out. its running decent right now, just a little hard to keep running at first start up when its cold, and it feels like its still a little low on power. would a vac leak seem better once its warmed up?
Yep. Would be balky and hesitant when driven cold from startup

I learn more about cars every day!
I do it just because I still want to know HOW and WHY!!! Quit learning=die. Be informed as to WHAT, rather than learn,=brain-dead already.
__________________________________________
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