Question about Geo Prizm

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1992 geo prizm start but won't run we have changed the fuel filter fuel pump distributor cap and rotary button coil pack battery and alternator plugs and wires the catalytic converter was glowing red

We also removed the catalytic converter to make sure it wasn't stopped up

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  • Geo Master
  • 1,045 Answers

Sounds like the cat or muffler is plugged. If there is an 02 senor ahead of the cat or muffler take it out and see if the car will start, it will run rough but if it starts one of them is plugged and it most likely is the catalytic converter in the exhaust system.

Posted on Apr 19, 2017

  • Jerry Ross
    Jerry Ross Apr 19, 2017

    Sorry I did not see it until I had posted the you had removed the cat. Can you put gas in the sys. and get the car to start. If so It maybe the fuel pressure regulator.

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1 Answer

Engine cranks but will not start


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Your testing so far seems to exonerate components #1 to #5, and #13.
Since you've already replaced a number of parts to address the problem, I thought I should try to be comprehensive:

Priority Action Part Type Cause
1 Inspect Ignition Switch - Improperly Connected or Faulty Ignition Switch.
2 Inspect Battery - Battery Discharged or Faulty.
3 Inspect Battery Cable - Coroded, Broken, Shorted or Poorly Connected Battery Cable.
4 Inspect Starter Solenoid - Starter Solenoid Faulty.
5 Inspect Starter Motor - Starter Motor Faulty.
6 Inspect Wireset - Worn or Damaged Spark Plug Wires.
7 Inspect Ignition Coil - Faulty Ignition Coil.
8 Inspect Distributor Cap - Loose, Cracked or Worn Distributor Cap.
9 Inspect Spark Plug - Incorrectly Gapped or Fouled Spark Plug(s).
10 Inspect Distributor Cap and Rotor Kit - Loose, Cracked or Worn Distributor Cap, or burned rotor contacts.
11 Inspect Fuel Tank - Fuel Tank Empty.
12 Inspect Carburetor - Worn, Faulty or Damaged Carburetor.
13 Inspect Fuel Pump - Faulty Fuel Pump.
14 Inspect Fuel Pump Strainer - Fuel Pump Strainer Clogged.
15 Inspect Fuel Filter - Fuel Filter Clogged.
16 Inspect Air Filter - Air Filter Clogged.
17 Inspect Fuel Injectors - Fuel Injectors Clogged/Inoperative
18 Inspect/Test PCM - Powertrain Control Module (Computer) defective - sending incorrect ignition/timing signals to fuel injectors
19 Inspect Fuel Rail - Fuel Rail leaking/broken causing inadequate/low fuel pressure.

Use a HEI (High Energy Ignition) tester to see if you have spark to your sprak plugs - if not, suspect Ignition Coil, Distributor Cap, or Distributor Rotor.

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I have one too, almost same problems. I had to change the control module. Try that cuz I went through the whole list with no luck. Control module made it work

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1 Answer

My 1990 geo prizm will turn over but won't start. I replaced the fuel pump but that didn't solve the problem. Help!!!


Being you replaced the fuel pump and that had no effect I would now check if you have spark if theres no spark check your distributor or coil packs if you have coil packs check the crankshaft position sensor that sensor if its bad could cause a no spark condition...

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95 geo metro 3cyl. 1.0L no spark changed


Pull one or two sparkplugs and check them for moisture; not fuel, but for water beads.
I don't know how long your engine ran after losing coolant but there is a chance that you lost the head gasket and have gotten water into the cylinders.

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1 Answer

1993 Geo Prizm is turning into a money pit. now it has an exhaust leak. It also sputters through all gears at the start. Could this be due to thw exhast leak or a bad fuel pump???


I don't think an exhaust leak would cause the sputtering in all gears. I've run my Geo in the past with a cracked exhaust manifold for months, and it ran fine, just a bit louder. Are your spark plugs & wires in good shape (missing vs sputtering)? Also check inside the distributor cap for corrosion/carbon build up. If all that is ok, then I would start with the basics: first try running a complete fuel system cleaner through it for the next two tanks, that should clear any partially clogged fuel injectors. If no luck, then replace the fuel filter, and try it, if it still sputters you can check the fuel pump strainer if it looks ok, then you might want to replace the fuel pump.

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1 Answer

1995 geo prizm lsi starting problems.


There is a long list of possible causes, You would have to check into each individual one.

1.) Failing fuel pump.
2.) Bad valve seat/seal
3.) Sticking valve
4.) Timing is off, Reset timing to 10* BTDC
5.) Clogged fuel injector(s)
6.) Your new ignition coil (as im assuming thats what you meant by "Igniter") may be faulty.
7.) Wiring to the new ignition coil may be faulty
8.) Spark plug wires not firmly in place.
9.) Faulty Distributor pickup coil and/or wiring harness/wiring.

The list goes on and on, Some are more likely then others. Personally, from experience (having owned 4 95 geo prizms myself in my lifetime) i would go with the clogged injectors, Fuel pump, and distributor pickup/wiring in that order. Those engines last quite a long time when properly cared for, An internal engine problem (Although possible) is unlikely in my opinion.

Feb 02, 2009 | 1995 Geo Prizm

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