Runs fine but randomly surges

Tiny
SHORTY111191
  • MEMBER
  • 1995 JEEP
When I accelerate it sounds like it is backfiring out of my air filter box My jeep will do this when it wants to. I can't pinpoint a pattern or whatnot. While driving my RPM's seem to be running right and my speed is fine but it will go through this spurts where my RPM's start surging and when I accelerate my jeep chokes and coughs and will not gain speed. Sometimes it will die but other times I have to shut it off, turn it back on and floor it to try and "clean" it but it ends up doing it again.

I replaced my fuel filter and my IAC thinking that would help. I can notice the IAC has made it less frequent to surge than before but it still does it. During this process it will backfire through my air filter box and sometimes through my exhaust. I pulled my throttle body off and cleaned it, as well as the sensors attached that I did not replace. I don't understand what is doing this, I have done process elimination and it just won't work. Any answers or advice?
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Sunday, August 18th, 2013 AT 1:31 AM

3 Replies

Tiny
HMAC300
  • EXPERT
Scan for codes and check fuel pressure first check spark plugs for to large a gap or oil soaked.
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Sunday, August 18th, 2013 AT 6:31 AM
Tiny
SHORTY111191
  • MEMBER
Hello hmac300 do you have any other advice other than this? I have a 1995 Jeep Grand Cherokee Laredo the problem with that is because it was after 1995 so I don't have a regular diagnostic or anything. Not only that, my check engine has not came on at all for this problem. I did do the ignition diagnostic for check engine but it had nothing to do with this problem and I was just seeing what it gave me (the light isn't on at all.) As far as the spark plugs, wires, cap and rotor I have replaced. I do keep reading about the fuel pressure for one, do you have to go to a shop to have them do it with a special tool or what and for two can you explain what this may have to do with the issue I am having. I know process elimination is all there is but no one can pinpoint it and many people with Jeep's have this issue. Others may be a different result. Please let me know!
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Sunday, August 18th, 2013 AT 7:25 AM
Tiny
HMAC300
  • EXPERT
You have to do the two thing I told you so you don't blindly replaceparts to solve the problem and it doesn't fix a damn thing. Except empty your wallet. Most auto parts rent fuel pressure gauges and are connected to fuel rail. Sometimes adapters are needed to check it but most o f the time it's a Schrader valve like a tire.
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Sunday, August 18th, 2013 AT 8:07 AM

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