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Hi, I have a Mitsubishi RVR 1998 with engine 4G93. I have a problem when the car is cold. The engine starts perfect but when I try to star driving and press the gas pedal the car begins to fail (false combustions). I have to drive for a couple of blocks very slowly and then when the engine is warm the problem disappears. Any idea?? The mechanic changed the four coils, spurk plugs and wires but the problem is still present.

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  • 46 Answers

Auto choke stuck

Posted on Dec 06, 2013

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6ya6ya
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Posted on Jan 02, 2017

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seans46
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SOURCE: 2001 volvo s40 turbo.......misfire p0302.......misfire p0303

you have good fuel pressue but do you have enough volume? when was the last time the fuel filter was replaced? and remember this if you replaced the injectors did you replace as a set? oem injectors have a 1 to 2 % veriation aftermarket can have 45% veriation so always replace as a set and get a good set. or you can have driveability problems. but do the fuel filter first and it is a service item which should be changed and this sounds like a fuel filter issue. if this fails to fix it first you can have a shop test the fuel pump with a scope to check the wave pattern and check both press and vol. second on a scanner you can look at live data and check the mass air , tps , o2's the o2's should be going above 500 and below 500 switching from rich to lean , the tps check % on live data they are 0 to 100% , these items also can be checked by a volt meter for resistance a shop would know the values of each. start with the fuel filter then rule out each sensor. proccess of elimination if you do it your self google all info and diagrams you can and take your time rule out each one you will find the problem . one other thing to do is when the engine is cold start it up and spray the intake with brake cleaner listen for changes in rpm to rule out any leak from intake otr vacuum lines ect. this is a always passed over thing .

Posted on May 31, 2009

alicantecoli
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SOURCE: 2004 Hyundai Terracan, 2.5 turbo diesel, manual.

right renew the glow plug timer/relay if you put a meter on the glow plugs when cold and turn ign on (with help) it should supply power for a about 20 secs ,time depends on outside air temperature ,if all else fails then do a colin --- use a push button switch,wired to a relay so glow plugs can be operated by pushing the switch which you will mount on the dash ,cant beat a manual overide system

Posted on Dec 14, 2009

Testimonial: "alicantecoli provided accurate and correct advice for the diesel cold engine start problem I had."

Elradiuzi
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SOURCE: Volvo s40 white smoke and jerking, can it be plug coil problem?

It could be a coil. Or it could be a fuel injector. Also. Record your gas mileage by filling the car up and recording the number of gallons that the gas tank took. Reset the trip odometer and drive as normal. At the next fill record how much fuel again went into the gas tank. divide the gallons of gas at the second fill with the miles driven and that will be your mpg average. If your getting anything lower than 19 it's probably a fuel problem and should be taken to a different mechanic for a second opinion.

Posted on Jun 28, 2010

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The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems ca cause many drive-ability related problem such as rough idle and other symptoms


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