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97 mitsubishi rvr 4g93 gdi wont take full revs it coughs and backfires but when throttle is released to a certian point it will allow engine to rev to 4000rpm

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I can't be 100% sure without testing the vehicle with a scanner, but just by symptoms it sounds like it is running too rich. So there are quite a few things to check that can cause this kind of situation, throttle position sensor, oxygen sensor, injectors, etc. Start with the easiest to test and less costly to replace, IE the throttle position sensor. Also, timing might be off because of a defective, worn or dirty crank position sensor/ring. The best bet would really be to get a mechanic with a real scanner to verify the data the car's computer is giving out to see if all the sensor readings are normal or not, and give you a better idea of where the problem is. Also, if you're really savvy but just don't have a scanner, you can always get a 20-30$ USB to OBD2 reader off the internet. I use one with an ELM327 based chipset and works great on any computer with win xp or better, you just to need to find good software to go with it, cause they only give you a demo on the CD that comes with it, but you can find decent stuff on the internet on the torrent side of things, is you know what i mean. :p

Posted on Jan 04, 2014

Testimonial: "sorry this the first thing i thought of have had it pluged into a scanner and the vehicle has no codes have also removed the timing covers and all timing marks line up have also removed the egr valve and cleaned it out also so are at a bit of a dead end but thankyou for your advise"

  • Gilbert Labont?
    Gilbert Labont? Mar 25, 2014

    sorry if it's been a while since my original solution. If timing seems right and no codes, then might be idea to check if there isn't an injector that stays stuck open, that would make it run rich and change the compression in the cylinder. You can get an idea if this might be the problem by checking if there seems to be gas in the engine oil. If so, then this is quite probably your problem. If not, check for air leaks coming from damaged/worn gaskets, unplugged or damaged vacuum hoses and such. If that doesn't give anything, just write back and i'll try to check out what else could cause this.

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SOURCE: gdi 1800 cedia wagon-odometer 80,000km exact, starting, no power

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SOURCE: my engine wont rev on kickdown 1989 corvette

your torque convrtoer is shot. it is the at the front of the tranny to transfer motion from fly wheel ( engine side) to the trans. its a fairly cheap and easy fix.

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SOURCE: Spark Plugs for 1.8L 4G93 GDI Engine

the correct transmission fluid is ATF+4, any other trans fluid will spoil the transmission.
i use platinum spark plugs in my engine, works great.

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SOURCE: my mitsu rvr wid 4g93 engine backfires.

I have newly purchased a RVR with an engine 4g93 I noticed that there is Turbo or intercoler 4g93T, my I ask if it is possible to convert my engine from 4g93 to 4g93T? pls. advice me ASAP, thanks to you all

Posted on Aug 29, 2009

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