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adiobampro369
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May 2, 2009, 5:55 PM
Post #1 of 7
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95 Geo Prizm acting up
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My 95 Geo Prizm is acting funny and I have done a few things to try to fix it. Well my computer was saying Error code 72 which is my EGR Valve. I replaced it and cleaned out my Intake manifold. It was running good then it started to do it again. Well what happens is my car will be running fine when Im driving then sometimes it will start to make rapid sputtering sound then start to run fine again. But then if I try to kinda punch the gas and get going quick it will speed up then when the RPMS get high cut out then cut back in. Like it will start going fast then slowing down right when before it goes to switch gears. Please help. I will try to explain more with questions you ask but its hard to describe the sounds on the computer.lol. Oh and I have replaced the fuel pump and I got one from a junk yard and I think it goes to a 1.6 liter engine and mine is a 1.8. So i dont know its maybe the pump is trying to suck gas in and the engine is going faster then what the pump can pull? i dont even know if that is a possibilty.
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Loren Champlain Sr
Veteran
/ Moderator
May 4, 2009, 5:16 PM
Post #2 of 7
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Re: 95 Geo Prizm acting up
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adio; According to my specs, the 1.6 and 1.8 use the same fuel pump; The pressure spec is 38-44psi. Did you check or replace the fuel filter?
The EGR won't affect engine performance unless it is open or leaking. I have seen 'over-agressive' EGRs. Many of the 'aftermarket' valves have multiple orifaces which you must identify as the correct one for your application. You may want to plug the vacuum line and take it for a drive? Have the codes pulled again and post here.
The engine does have a rev-limiter, so once you get to that pre-set engine speed, which should be around 4500rpm, it won't go any higher. What you are describing could be a lack of fuel or even a misfire.
Loren
SW Washington
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adiobampro369
User
May 12, 2009, 2:27 PM
Post #3 of 7
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Re: 95 Geo Prizm acting up
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I never messed with the fuel Filter. Sorry about the late reply. Could that make my car stop taking fuel when im cruising at about 60? if my car idling it will just shut off. but it fires right up but its like the fuel is clogged or something. but i blew out the lines from the fuel pump up to the injector rack clean with an air hose. Someone told me that my pump might be working harder then what it can handle. if i turn the ac on the it starts to act up so i thought the pump was acting up when i start to over work it.
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Loren Champlain Sr
Veteran
/ Moderator
May 12, 2009, 4:02 PM
Post #4 of 7
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Re: 95 Geo Prizm acting up
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adiobampro; I always recommend replacing the fuel filter when replacing the pump. It is a maintenance item that should be replaced at least once a year or 15K miles. That may be overkill, but better to replace a filter than a fuel pump. You can burn out a pump if the filter is restricted or plugged. Or, allowing the fuel level to be low too many times. You still may have other issues, but I'd start with the filter.
Loren
SW Washington
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 12, 2009, 5:28 PM
Post #5 of 7
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Re: 95 Geo Prizm acting up
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Ditto!
Toss fuel filters often! The junk we get for fuel isn't as good as it once was - depending on where you are. Places that mandate use of alch in with the real gas causes the fuel at the gas stations and in you tank to suspend debris rather than sit quietly at the bottom. It might not be the issue but make a habit of putting in new ones a lot more often then book might even suggest.
Any is better than non doing it - I prefer NAPA Gold filters or Wix which should actually be the same,
T
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adiobampro369
User
May 13, 2009, 3:22 AM
Post #6 of 7
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Re: 95 Geo Prizm acting up
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Alright, I see what you mean and I looked the parts up. And hopefully I will be able to go buy one today. Thank you for the help! I will post up and let you know if it worked or not. Once again Thank you both of you!
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Loren Champlain Sr
Veteran
/ Moderator
May 13, 2009, 5:01 PM
Post #7 of 7
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Re: 95 Geo Prizm acting up
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adio; Don't thank us, yet. Let's see if we get lucky, first.
Loren
SW Washington
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