robcom
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- Nov 8, 2005
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- VH V8
Hi everyone, I,ll get straight to the problem at hand and thanks in advance to the people who get to the end of this post.
I just got my car dyno tuned (VH with VN injection unregistered), when I pulled it off the trailer it was running great up and down my street with not a hint of a problem. Then something went wrong, here are the sequence of events.
Between putting it in the garage and starting it the next time all I've done is wrapped some cables with heat sheilding tape and double clamped my fuel lines, inlet and return being careful not to clamp the fuel supply.
When I went to start it the next time the battery seemed dull but it started and I let it idle for a while and then gave it a rev and it ran like a bag of **** like it was flooding or missing real bad.
So I did some preliminary checks and found the alternator was shagged so I replace that and still no good.
Then I started checking leads and coils but the spark seems good and the leads have good resistance values and there is a good spark.
Then I checked all the sensors for resistance values and voltage values as by the manual. and all check out fine. Yet to do the o2 sensor.
Fault code 12 showing in diagnostic mode so all OK.
When I rev it, if I give it a quick stab to full throttle the thing bogs down and won't rev over 2-3 thousand and black smoke coming out of the exhaust. But if I gently bring the revs up it will got to full revs but coughing and spluttering all the way.
The plugs are black as the ace of spades so I am definitely getting fuel, just too much of it or not enough spark.
Here is the tricky part, when I disconnect the MAP sensor wiring the thing comes back to life, revs freely and no bogging down.
Remember I haven't checked the o2 sensor.
Does anyone have a suggestion as to what this is?
Has anyone seen this before?
A bit confusing when the MAP sensor wiring is disconnected and it goes good seeming that this sensor is a major part of the system.
Thanks
Rob.
I just got my car dyno tuned (VH with VN injection unregistered), when I pulled it off the trailer it was running great up and down my street with not a hint of a problem. Then something went wrong, here are the sequence of events.
Between putting it in the garage and starting it the next time all I've done is wrapped some cables with heat sheilding tape and double clamped my fuel lines, inlet and return being careful not to clamp the fuel supply.
When I went to start it the next time the battery seemed dull but it started and I let it idle for a while and then gave it a rev and it ran like a bag of **** like it was flooding or missing real bad.
So I did some preliminary checks and found the alternator was shagged so I replace that and still no good.
Then I started checking leads and coils but the spark seems good and the leads have good resistance values and there is a good spark.
Then I checked all the sensors for resistance values and voltage values as by the manual. and all check out fine. Yet to do the o2 sensor.
Fault code 12 showing in diagnostic mode so all OK.
When I rev it, if I give it a quick stab to full throttle the thing bogs down and won't rev over 2-3 thousand and black smoke coming out of the exhaust. But if I gently bring the revs up it will got to full revs but coughing and spluttering all the way.
The plugs are black as the ace of spades so I am definitely getting fuel, just too much of it or not enough spark.
Here is the tricky part, when I disconnect the MAP sensor wiring the thing comes back to life, revs freely and no bogging down.
Remember I haven't checked the o2 sensor.
Does anyone have a suggestion as to what this is?
Has anyone seen this before?
A bit confusing when the MAP sensor wiring is disconnected and it goes good seeming that this sensor is a major part of the system.
Thanks
Rob.