1990 Buick Regal - Answered Questions & Fixed issues

one of two things the transmission fluid pump needs replaced or the transmission filter is clogged replace it if the pump is bad a tranamission rebuild will need to be done also make sure your coolant is not low on antifreeze

The injectore do not fire they simply open and squirt fuel. check the fuse for the fuel pump and fuel pump relay before we go any furthur

Is there a good vacuum supply to the MAP

The fuel pressure regulator on w bodies is right on the fuel rail. It looks like a top that kids play with sort of, there is a vacuum line that plugs into it, ironically this is how you test it, you simply unplug the rubber line that plugs into it and smell the end of that hose, if it smells like gasoline its bad, if gas drips out, its really bad. BTW this is usually the culprit when 3.1 act like what you described. Also if you have an oil leak on the end of the engine, drivers side, it is a pretty simple fix, the oil pump drive is where its leaking it is a simple o-ring, make sure to get a silicone one or you will probably be doing it again soon, NaPA has them on their help rack. Best of luck.

have mechanic run compression test. might need rings or valve job

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Broken speedo gear. Gonna have to pull the gauge cluster.

check fuel pressure,fuel relay.

A lot of new parts! Have a compression test done to gauge the engine's internal condition, and go from there. If compression is good on all 6 cylinders, scan for trouble codes. The compression test may find your problem, something like an exhaust valve burned or not seating properly.

what make and model and year

Electrical problem, more than likely. Battery not holding charge or alternator not charging battery.

locate and check the dimmer switch,if it is okay check the bulbs

Just to clarify, cranking is the same thing as turning over.If it cranks but does not start, you need to check the fuel pressure with a gauge before and after you try to start it.The pump relay allows the pump to run for 3 seconds before the engine cranks to boost pressure in the line. If the check valve in the pump is bad the pressure will drop off when the engine is not running.

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?fromSearchPage=true&pageId=0900c15280067e10&partName=Coolant+Temperature+Sensor++CTS&partId=0900c15280067e10 Here's a link to it.

The sensor is located at the bottom of the engine behind the harmonic balancer. To the right side of the motor. You have to remove the pulley to replace the sensor.

Sounds like you need to replace the filler neck assembly

replace the coil pack.

You have leaking engine cylinder head gaskets, this may be the cause of the overheating or a result of it, replace the head gaskets and have the radiator cleaned by a by a radiator repair shop, that should cure the problems.

You should just have the correct ECM and PROM inside of it.
When battery power is removed from the ECM it will reset to factory defaults. When you install it and start the vehicle it may run rough. Some drive and key cycles will "relearn" the ECM.
I have seen a number of vehicles do this just after replacing the battery.

http://www.newbuickparts.com/seccat/regal-356/1990/windshield-121/