Question about Caterpillar CAT MINI PLAY DUMP TRUCK,STEAMROLLER,CATAPILLER,TRACTOR,BACKHOE

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I have a 2003 6nz cat that is missing at a steady rpm and also has developed a vibration in it. i have changed the fuel filters and ran lucas injector cleaner threw it. it does not throw any codes

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2 Answers

2004 liberty 107000 miles. Engine runs rough at 2000-2500 RPM causing steering wheel and gas pedal vibration. plugs due to be changed.what else could cause this rough engine


I think you are on the right track with a tune up. Replace the wires, air filter and oil as well. I also would run a cleaner through the fuel lines. An STP or a Lucas would be better.

Dec 12, 2015 | Cars & Trucks

3 Answers

Misses


Have you tried replacing the fuel filter? They're pretty cheap and easy to do and if they get clogged they can cause problems. If that doesn't work get a fuel pressure tester you can rent from parts stores like auto zone and you can test your fuel pump

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Missing on passenger side of engine. Gas floods through and comes out exhaust. Replaced fuel pressure regulator.no change. Checked compression on all cylinders.120 - 190 psi. Dropped exhaust at engine,no...


Its possible that your crankcase is full of gass too, I suggest change oil and filter, also, if it wont go over 40, the converter (catalytic) is probably damaged as well, raw fuel in the exhaust will break up the cat. Oil change is imperitive as too much liquid in the crankcase will destroy an engine in seconds. Can also be caused by the clogged converter, too much backpressure.

Get a vacuum gauge, hook into a manifold vacuum source. Increase RPM to 1500-200 and hold steady, if vacuum gauge falls, exhaust sytem has a restriction, the cat or muffler or a pipe has a broken chunk of the cat blocking it.

Hope helps; keep us updated.

May 29, 2011 | 1990 Subaru Legacy

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Ive got a 99 tahoe, 5.7 vortec, with 165k. Its missing when I drive up hill, and slowly accelerate. usually around 1700rpm. It had a tune up, and tranny serviced shortly before I bought it at 157k. since...


Most of the time when you run a fuel system cleaner in a engine that has not had a cleaning the sludge will clog the fuel filter. I would check the fuel filter before anything and if that is good, I recommend running a complete test on the vacuum lines sometimes if there is a leak in a vacumn line it will mess with the timing advance and cause the vehicle to behave different at certain RPM ranges

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1 Answer

I have a 1992 toyota camry tha wont crank. and just for simplicity i will write a time line of what has gone on with the car. -Replaced timing belt(year ago) -Replace broken motor mounts(3 months ago)...


Battery Charged ?

Battery leads tight and clean?

Checked Engine earth ?

If all OK then motor probably got some **** on the brush gear get sombody to help you, firmly apply hand brake.... ENSHURE IS IN NUTRAL OR PARK!
while they hold kek in crank position tap the starter motor with a hammer to free the crrap... that shuld do it!

Have A Great Day.......Bruce

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2 Answers

I have a 1987 Maserati BiTurbo Si (injected). Engine ran very well but now the idle is falling off. There is a 'miss' and the low idle is lopey (bumpity-bumpity-bumpity) until it falls off. With the rpm...


It might be an engine management system (the MABC- Maser Auto Boost Control) gone wonky. That or a faulty O2 sensor or even a poor fuel filter (or 2, since most US SIs have a redundant one). Even a bad cat could do it. You could spend some time on this...

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Missing and stumbling during acceleration


4.2 ltr missing. 2000 truck, f150. Changed plugs, wires. Ran great for 2 weeks. Started again. Changed coils. Got worse. Changed fuel filter, did nothing. Added injector cleaner and fuel cleaner, nothing. Checked EGR, o.k. It is getting worse. Had new gas about the time it all started.

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1 Answer

95 gt stumbles at steady rpm


check egr for carbon build up if it sticks will cause engine to stumble.idle air control will also cause problems of same manner.gaskets are cheap autozone has them.

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