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Old 06-08-2011, 10:53 AM   #1
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Dang...Fuel pump? Injector? Help!

Have a 1998 TJ SE, 2.5L 4 cyl, 140,00 miles : no engine mods except for Air raid intake.
Dang, just bought the jeep a couple months ago. Been driving easy close stuff around town with no problems.
Had to drive the jeep on the hwy about 180 miles. Near the end of the journey it started to act as if there was no gas getting to the engine. Had a loss of power, and my wife said there was a loss of brake power. I drove it and experienced the loss of power, but did not notice anything about the brake. The power loss is temporary acting as if it may stall then comes back around and I continue on as normal.
No engine light ever came on. I have not checked for any codes. Don't know how to yet.
Took it to the local shop that does all the work on jeeps and crawlers and had them check it.
The guy said he drove with no problems. Did a pressure check with no problems and said he doesn't know what it could be. But a new fuel pump installed is $500.00.
Could I take it to autozone and get it checked for any codes(problems)?
Is it the fuel pump? Injector? Something else?

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Old 06-08-2011, 11:19 AM   #2
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First, a new fuel pump takes an hour to install and you can find them for $180 on RockAuto Auto Parts where I bought mine last year. $500 is a pretty steep price to install a new pump.

A lack of brake power is not surprising when the engine is stalling since it is vacuum generated by the engine that powers the power braking system.

Codes on a 99-00 TJ can only be read with an external code reader but without a CEL, I doubt your engine has any diagnostic codes to look at.

At this point, I would first suspect the Crankshaft Position Sensor which is mounted on the transmission bell housing where it bolts to the engine. This sensor generates the engine's master timing signal and if it goes bad, the engine will stop running like you turned the ignition switch off. It can go intermittent too, like yours is.

Next down on the list is the Camshaft Position Sensor which is mounted inside the distributor housing, under the distributor cap. There is a plastic protective cover under the rotor that covers this sensor. It tells the engine what position the camshaft is at and it can cause the same symptom as the Crankshaft Postion Sensor. This sensor is more protected though so it doesn't fail as much as the Crankshaft Position Sensor does.

Only after those two sensors would I suspect the fuel pump.

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Old 06-08-2011, 01:03 PM   #3
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Thank you Jerry. I'll change those out. If nothing else it's some preventive maint. for 140000 miles.
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Old 06-08-2011, 02:54 PM   #4
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Jerry, any chance he could have a cat going bad?
Similar symptoms, loss of power and the loss of vacuum to the brakes.

Maybe a chunk of the honeycomb broke loose and at times is blocking off the exhaust?
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Old 06-08-2011, 03:51 PM   #5
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The cat sounds more likely - if it was a crank or cam sensor, he'd be complaining that it dies, not just a lack of power.
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Old 06-08-2011, 08:28 PM   #6
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I might have misinterpreted what he described as a power loss. I was thinking he meant the engine was totally crapping out and dieing intermittently. If the engine is continuing to run but with with much less power, yep the cat could have disintegrated internally and its busted up ceramic element pieces plugging the exhaust enough to cause it to lose power.

Take a rubber mallet and beat on the cat to see if you hear rattling inside. If you do, that's a sure sign the ceramic element inside the cat has busted up and is very likely the cause of the problem. Even if you can't make it rattle with a rubber mallet, the cat could still be clogged. A muffler shop can do a quick pressure test on it to see if the cat is plugged and clogging up the exhaust system.
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Old 06-09-2011, 09:25 PM   #7
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Have the crankshaft position sensor changed. AZ gave me the wrong cam position sensor part so that didn't get changed.
Local muffler shop did a pressure cat test and it's fine.
Changed the plugs, wires, and oil.
Cleaned the Air Raid intake and the engine compartment.

However, being the smart guy I am, since the fuel pump MAY go bad with momma driving it, it would be no matter. It's getting changed. Figure changing it since the engine has 140000 miles is good PM anyways.
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Old 06-10-2011, 03:39 PM   #8
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It was the fuel pump. The filter was sitting at the bottom of the tank, off the pump and apparently there are gears or something inside the pump and sand is not OME.

On the drive home it seemed a little more responsive, or it could have just been me.

Oh, and it was the original pump.

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