Question about 1994 Toyota 4Runner

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The original injection pump of toyota surf is replace by mechanical pump,the result is over smoke exhausted?

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Slow down and please explain in plain english ,you hasve changed the injector pump ---- and what??? its smoking??it doesnt run ?? what appears to be the problem

Posted on Oct 02, 2010

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1 Answer

I put in new injectors but it smokes as if its over fueling


Over fueling meaning black smoke? Was this occurring before you replaced the injectors?

Have you checked the air filter and intake for restriction;

If engine is turbocharged check for boost leakage, condition of turbo;

Check quality of fuel;

Check injection timing if mechanical pump, check valve timing and lash adjustment;

Check for excessive exhaust restrictions;

Check compression of all cylinders and Compare;

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After you reconditioned the motor, pump and injectors, it shouzld work fine. Firstly, recheck the valeve and injection pump timing. If that is ok, then its possible that the exhaust is too blocked and full of carbon and unburnt fuel. I would suggest that you take the car to an exhaust specialist, who can measure the exhaust pressure to see if it is indeed blocked. If so , then you will need to replace it.
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1 Answer

The car's peformance has been poor, especially on picking from a stationary position (no power).


I would suggest to have the pump timing reset and probably have a diesel specialist to check the pump as well. It is very difficult to give extra help over the net as most of the things have been covered by the mechanic I supposed. But as per your description I think the pump may have not been timed properly or it may need overhauling as well.
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hi there, i had exactly the same problem with mine. all i did was to turn up the diesel pump a little. cheers d

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