Solved: Engine Loses Speed/Power on highway @ 50 mph

Information on the naturally-aspirated KA24E and KA24DE engines.
mister ed
Posts: 2
Joined: Sat Feb 02, 2013 7:06 am
Car: 1994 Nissan D21 Hardbody P/U KA24E engine

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I have a 94 Nissan D21 w/ KA24E engine that has started to intermittently lose power out on the highway. Typical event: 50 mph, level road, 4th gear, 2 wheel drive, vehicle slows to 40 mph or so and does not respond to depressing accelerator pedal. I know the EGR valve or vacuum line is dirty/needs replaced as the check engine lite goes on and off because of this- verified code on computer monitor unit.
I have eliminated the catalytic convertor and fuel filter as possible problems.
Is the next logical step to look at the fuel injection pressure regulator or the fuel pump?
I don't presently have a gauge to check the system fuel pressure. It starts, idles, and accelerates fine.

Truck has about 190K on it. Original owner.

Troubleshooting advice is appreciated. I do have a Chilton's Manual for reference.
Last edited by mister ed on Sat Feb 16, 2013 7:14 am, edited 1 time in total.


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Razi
Posts: 28681
Joined: Sun Dec 31, 2006 9:52 am
Car: Moo

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Figure out the issue with the EGR and vacuum lines.
I believe you can buy or rent a fuel pressure gauge at Autozone. Shouldn't cost that much.

mister ed
Posts: 2
Joined: Sat Feb 02, 2013 7:06 am
Car: 1994 Nissan D21 Hardbody P/U KA24E engine

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After 300 miles the truck has not repeated the problem. Hopefully changing the fuel filter has fixed the issue.

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Razi
Posts: 28681
Joined: Sun Dec 31, 2006 9:52 am
Car: Moo

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yay!


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