Question about 1994 Pontiac Grand Prix

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Why does my ford crown vic engine shakes when I start it up? When I put it in reverse or drive it hesitates when i accelerate especially going up hill. When I'm braking it feels like the tranny is having a hard time down shifting into first gear. I have changed the throttle positioning sensor, spark plugs, fuel filter, air filter, and i also got it put on a smoke machine to see if I had a vacuum leak. No leaks were found. I have not changed the spark plug wires in a year and a half. I found a lil bit of water in the spark plug wire terminal. I got that cleaned out then i changed the plugs. Could that have damaged my wires? Please i amin desperate need of help.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

3mac
  • 61 Answers

SOURCE: 1998 Pontiac Sunfire won't accelerate

I assume that you do not have a "check engine" light?

The next thing I would do is check the pressure from the fuel pump. You can have this done at your preferred garage, or by purchasing a fuel pressure gauge from any parts store.

Vent the fuel tank vapors by loosening the fuel cap. Remove the electric fuel pump fuse and start the engine. Allow the engine to run until it runs out of fuel and stalls. After spinning the engine over for a period of 3 to 5 seconds, turn off the ignition switch and install the electric fuel pump fuse. Next, install a fuel pressure gauge in the fuel rail supply line, and secure the fuel tank cap. With the ignition key in the on position, verify that no leaks are present and start the engine. Visually verify the PSI reading on the gauge. The pressure for your vehicle should be 41-47 PSI (Pounds per Square Inch). Hope this helps and good luck!

Posted on Jan 13, 2009

fixincars
  • 335 Answers

SOURCE: 1993 pontiac grand prix 3.1 liter

the 3.1 had some EGR problems, EGR valve stuck open, blown diaphrams, Plugged passages Im not saying that is all your problems and I believe yours has whats called a linear EGR about $350.00 from the dealer (and that is the only place you ever consider buying such a critical part for the emissions system regardless of the cost)
That car is so antiquated as far as computers go that relying on the codes is nearly pointless! Map code can set because of low engine vacuum which you will have with a poor running engine, Check for 5 volt reference voltage at the TPS and MAP with the key on and engine off if no 5 volt reference I suspect a Computer. Computer Ground is on the Thermostat housing and needs to be clean and secure.
There is a legit test in the GM factory manual called the TAP TEST take the ECM (computer) and slap it with an open hand, if the symptoms change the ECM is bad it's very common in the early-mid 90s for the computers to go bad in one way or another the circuit boards come loose and suffer also from cold solder joints.
Make sure the wires are on the correct plugs and hopefuly you used factory plugs and wires and No split fire or bosch plugs only AC delco
Make sure you have good spark on all 6 cylinders.
Contact me at fixincars@yahoo.com with the results and any feedback or questions

Posted on Sep 19, 2008

  • 3 Answers

SOURCE: no acceleration

I had the same problem with one exception. It would rev higher than 3500 but the higher it revved the more it bogged. I had the catalytic converter replaced. I thought I bought a new car. Acceleration is just like new. It was easy enough to test. My mechanic cut a hole in the exhaust pipe in front of the catalytic converter. It sounded like a truck but the acceleration difference was immediate. Easy diagnosis.

The car is hard to shift because the more you press on the accelerator the more the computer for the transmission won't let it shift. Which in turn causes the car to bog more sending more unburned fuel into the catalytic converter. Which in turn causes more carbon build up and more back pressure. Vicious cycle. It will only get worse.

My thermostat caused the entire problem. Thermostat was stuck open, engine never got to operating temp most days. Car burned rich. Bad gas mileage. A lot of unspent fuel being dumped into the converter. Probably have some underlying cause that needs to be addressed. Bad plugs, wires, coil, fuel filter.

Posted on Jan 21, 2009

  • 5470 Answers

SOURCE: Wiper motor replacement for a 99 crown vic

I replaced the same part on a 1994 Crown Vic. There are a few bolts which go through rubber mounts on the firewall and that is how the wiper motor fits against the firewall. There is a clip on the wiper drive that must be pressed and slid off the wiper shaft. The hardest part was getting clearence between the engine and wiper motor. If I remember there was a way to turn the wiper case to clear the engine. I have asked myself why this was engineered like this? There is nothing important in the way that 3/4" of clearance could have been given for removal.

Posted on May 06, 2009

csmock132
  • 4669 Answers

SOURCE: had major tune-up and tranny service done now it's hesitating going up hills and the engine light came on blinking and then went off but it loses power going up inclines edit save Saving... Last step

Sounds like a bad plug wire or coil.

Posted on May 30, 2009

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Car dies when accelerate. do i need new fuel pump?


Hello;
It sounds from your description that the fuel pump is weak. To check the fuel pressure you need a fuel pressure test gauge for fuel injection. Attach the gauge to the test port schrader valve and turn the ignition to the on position. Record the reading. Now start the engine and record that reading. Unplug the pressure regulator vacuum line and record the reading.
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Hope this helps you.
Thanks;
Rich
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