confused with 2 things 91 PA

I am having problems with 2 things on my 91 PA. First, I need a picture of the fuse box, and second, when I go to speed up (when I reach about 55-60), the engine starts sputtering and hesitating like it wants to die out, but when i let up off the gas and drop it to drive (no overdrive), it goes just fine....any ideas?????????

Usually what you have described is called "spark scatter", in mechanic slang.
By the way, “spark scatter” is caused by applying high voltage from the coils, to weak wires, or a high resistance in the plugs. Electrical current will travel the source of least resistance. In auto engines, that source is the nearest ground!

The problem is a common dilemma on these cars, due to the high final drive ratio and the lock up converter engaging at low RPM. Everything ignition and fuel related, has to be in top notch condition to overcome this problem. Even the slightest malfunction of any component will be noticeable while the engine is under load, and at low RPM.

I would start with the basics first, like plugs, wires, fuel filter (http://www.buickforums.com/forums/showthread.php?t=1446) and checking fuel (http://www.buickforums.com/forums/showthread.php?t=1446) pressure. That would be a good preventative maintenance function, if not recently done. You could also have a weak coil giving low voltage on one or two cylinders. Do the other items mentioned first and if that don’t solve the problem, try to isolate the problem to what cylinder is missing, and change the coil. Also, try some Lucas injector cleaner with your next three tanks of gas. (One tank, is usually not enough)

Since you did not say which fuse panel you needed a pic of, I will show all three. The first is under the dash, driver’s side, second one is under the passenger side dash and the last one is under the hood. The cover of each panel will have details of what fuse is used for.

http://files.automotiveforums.com/gallery/watermark.php?file=/503/297374buickrelaycenter-med.jpg (http://www.automotiveforums.com/vbulletin/%5Bimg%5Dhttp://files.automotiveforums.com/gallery/watermark.php?file=/503/297374buickrelaycenter-med.jpg%5B/img%5D)
http://files.automotiveforums.com/gallery/watermark.php?file=/500/297374fusepanel1.jpg (http://www.automotiveforums.com/vbulletin/%5Bimg%5Dhttp://files.automotiveforums.com/gallery/watermark.php?file=/500/297374fusepanel1.jpg%5B/img%5D)
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Thank you. Everything you have mentioned, I have done. I bought this car for $200.00 because the magnet in the timing broke off and the person I bought it from didn't want to fix it. About the only thing not new in this motor is the rear main seal, and and maybe a couple of fuses, which I needed the pics to find which one controlled my radio ant. because it doesn't want to come up. I gave it a complete tune up, fuel pressure is good, plugs and wires are good, fuel filter is brand new. Other than the 1 issue,:banghead: I have no problems with it. I have not replaced the lock out cylinder, that will be my next step, along with the lucas treatment. Thanks sooo much...

I bought this car for $200.00 because the magnet in the timing broke off and the person I bought it from didn't want to fix it.
...



Did you fix it yourself? Difficult?


I have not replaced the lock out cylinder, that will be my next step, along with the lucas treatment.

What what is "the lock out cylinder?"

Ed

Also try cleaning your throttle body and replacing the PCV valve. These two affect engine performance as well.

It was a pain in the behind!!!!!! But well worth the experience

cleaned the throttle body and the pcv is brand new

cleaned the throttle body and the pcv is brand new

Did that help at all, or is the problem still with you?

Ed

To me, the problem sounds a lot like a dying or dead ICM. Another possibility are the coils. The ICM can be removed (3 11mm bolts) and tested at an autozone or O'reily pretty easily. A good visual check is to see if any green, sticky goo is coming out of the electrical connection. If that is the case, then both the coils and ICM should be replaced ($150-200).

If not, then general maintenace parts may do the trick (PCV, fuel filter, air filter, plugs [no bosch!!], wires, O2 sensor, etc).