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Hi there, Ive recently purchased a toyota surf jap import 2.4td on a 1994. The vehicle runs fine on idle but when accelerating either on idle or when driving it kicks out a massive amout of black smoke. The vehicle feels alot quicker than i would expect and i think this is related to the fault. Other than the excesive amount of black smoke the engine sounds fine no knocking or anything. I suspect this is an EGR fault and procided as folowed- cheked vaccume at egr valve and there is no/very little vaccume there, ive checked all the vaccume pipes and there is no leaks i can find, then i checked the vaccume to the main vaccume pipe from the alternator and that is fine good vaccume.
ive done alittle research and ive herd alot about bypassing the egr valve but do not want to take this route id just rather get to the bottom of the problem. Anyways the main vaccume pipe runs along the top of the engine and branches off to two pipes one goes to a solenoid for controling a ufo device on the throttle houesing, checked vaccume into the solenoid and thats fine but there is nothing out of the solenoid. This outlet is used to supply the first egr valve solenoid (obviously no vaccume there) and the outlet of the first solenoid is used to supply the second egr valve solenoid then to the egr valve its self. If i vaccume the egr valve so that its partially open the black smoke goes but there is then a diesle knock and excesive white smoke (overfueling). This makes me think that it is definately a egr fault proberbly overfueling when i vac it due to an incorect amount of recerculating gas that is being drawn back into the inlet side? So i was led to belive that solenoids (two that control the vaccume to the egr valve and the one that supplies those (on the ufo looking thing) are not opperating as they should. This is where i need help, Ive checked for voltage to these starting with the solenoid on the ufo thingy. This is getting battery voltage to one terminal but nothing down the other pin (i think this is a switched earth from the engine ecu?). Then checking the first egr solenoid the same battery voltage down one pin and nothing down the other, and finaly the second egr solenid this has both a battery live and an earth. (sorry forgot to mention ive checked these with the engin running and also when reved up). But im stuck i have no info no wiring diagrams dont realy no the princables as to how the egr system opperates, i no what it does but dont no what imputs the ecu has to opperate these solenoids e.g sensors, engine speed from pump? e.t.c so basically i would realy realy apriciate any help on this idealy egr wiring diagrams? what imputs to te ecu this req for egr opperation, what the ufo thingy is? why is there 2 solenoids that control the egr? and under what engine opperation should the egr valve open and how much?
Hope i havent confused you all too much and can i thank you for reading my thread.
Martin
ive done alittle research and ive herd alot about bypassing the egr valve but do not want to take this route id just rather get to the bottom of the problem. Anyways the main vaccume pipe runs along the top of the engine and branches off to two pipes one goes to a solenoid for controling a ufo device on the throttle houesing, checked vaccume into the solenoid and thats fine but there is nothing out of the solenoid. This outlet is used to supply the first egr valve solenoid (obviously no vaccume there) and the outlet of the first solenoid is used to supply the second egr valve solenoid then to the egr valve its self. If i vaccume the egr valve so that its partially open the black smoke goes but there is then a diesle knock and excesive white smoke (overfueling). This makes me think that it is definately a egr fault proberbly overfueling when i vac it due to an incorect amount of recerculating gas that is being drawn back into the inlet side? So i was led to belive that solenoids (two that control the vaccume to the egr valve and the one that supplies those (on the ufo looking thing) are not opperating as they should. This is where i need help, Ive checked for voltage to these starting with the solenoid on the ufo thingy. This is getting battery voltage to one terminal but nothing down the other pin (i think this is a switched earth from the engine ecu?). Then checking the first egr solenoid the same battery voltage down one pin and nothing down the other, and finaly the second egr solenid this has both a battery live and an earth. (sorry forgot to mention ive checked these with the engin running and also when reved up). But im stuck i have no info no wiring diagrams dont realy no the princables as to how the egr system opperates, i no what it does but dont no what imputs the ecu has to opperate these solenoids e.g sensors, engine speed from pump? e.t.c so basically i would realy realy apriciate any help on this idealy egr wiring diagrams? what imputs to te ecu this req for egr opperation, what the ufo thingy is? why is there 2 solenoids that control the egr? and under what engine opperation should the egr valve open and how much?
Hope i havent confused you all too much and can i thank you for reading my thread.
Martin
GOT NO COWBOYS HERE?
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