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Old 08-22-2011, 01:03 PM   #1
Join Date: Jun 2011
Location: Miami Beach
Posts: 75
Engine Loses Power on the Highway, Help?

Hey guys,

I have a '95 with the 2.5L engine that has around 101,000 miles. I was on the freeway doing about 65 when all of a sudden the engine started misfiring/lugging/surging? Not sure what to call it, exactly. Basically, it feels like the engine sputters like it is low on gas and running on fumes, so it slows down briefly before it catches again, but never completely stalls. (I had half a tank left.) I limped home by downshifting and keeping the rpms up but once I got off the freeway and drove the streets, it ran fine.

I drove it to the shop the next day (no highway) but again, the engine ran fine and I couldn't get it check out since the were close. About a week later, after no issues I ran into the same problem on almost the same stretch of freeway, except this time my tank was nearly full.

It's weird how it's fine around town but this occurred twice at 60-65. My first thought was maybe the fuel filter but I just bought this I'm no mechanic so any advice would be appriciated. Thanks in advance.

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Old 08-22-2011, 03:20 PM   #2
Join Date: Jul 2011
Posts: 259
I would make sure the pump is in good shape first. Next would be making sure the gas cap is venting properly, not causing a vacuum in the tank.


'69 GTO drop top, have had for 7 years and done a full restoration on it.

1995 YJ, moss green with the 2.5/ax5 combo. 124K miles
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Old 08-22-2011, 03:52 PM   #3
vinni495's Avatar
Join Date: Aug 2011
Location: alta loma
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possobly your cat caonverter is piuging up ,that is a broken piece is rolling around blocking exit presure,when slowing down back presure is released leting broken piece fall down letting gasses flow again till blocked again.
we got a situation!!
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Old 08-22-2011, 07:05 PM   #4
Join Date: Jan 2010
Location: Las Cruces, NM
Posts: 2,303
Sounds like a fuel issue, water??..pump or pickup in the tank???The CAT might be a thought too.
(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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Old 08-22-2011, 07:33 PM   #5
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Join Date: Mar 2011
Location: gainesville florida
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had a saturn do this. turned out the coil went bad and wasnt sending a hot enough spark to maintain highway speeds but was fine around town.
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Old 08-22-2011, 07:49 PM   #6
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Location: indiana
Posts: 29
all good ideas would check fuel pump pressure may not have the pressure to drive at highway speeds
i'ts hip to be square
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Old 08-23-2011, 12:21 AM   #7
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Location: Miami Beach
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Thanks for all the suggestions.
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Old 08-23-2011, 12:28 AM   #8
Join Date: Feb 2011
Posts: 253
It's the cat I replaced mine with a magnaflow for 60 bucks problem solved. But you need 6" of extra pipe if you go that route.

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