Parker
New Member
- Joined
- Jan 14, 2011
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- Location
- Beaudesert
- Members Ride
- VQ Caprice V8
Hi, To all those out there with a 5ltr VQ etc. I have noticed many guys have had numerous electronic problems.
I had a very frustrating time with my 5ltr. Mostly because nobody had a clue, and that included professional mechanics. The scenario went like this.
Travelling home last Feb. the motor suddenly lost power and started to miss something shocking. I managed to limp home , about 8klm in fits and starts . Local mechanic said it was fuel pump, I had a spare ,changed it . No change to miss problem. I bought a Haynes manual and it said if there was fuel in the return line the pressure reg. was faulty. Changed it . still had problem. Found a guy in Sydney who said it was probably Ignition Control module . I bought an exchange reconditioned and updated
( improved economy and power) for $125 ,exchange from him. Still had problem. I then changed the IAC, the Hall FX unit in the dizzy and the MAP sensor. All this time the ECU gave a 12 readout meaning there was no prob ?? which really confused the issue. I then acquired an ECU from a VN V6 ,changed the MEMCAL chip to the V8 and bingo Problem solved. All this time everyone had said the last thing that would need looking at would be the main computer. How wrong they were. l During this exercise I had checked all the relevant voltages and they all read as per specs.
My only minor prob. now is that recently the motor needs to wind a bit longer than I would like before it starts, but only when hot after a run . Starts instantly when cold. And the starter is fine. Maybe the battery voltage is a bit low when hot?.
Next job when I get around to it, is to rebuild T700R 4 tranny . it is a bit slow to move off when cold but is fine when hot. That will keep me busy for a while, but is a heap cheaper than giving it to a workshop.
I had a very frustrating time with my 5ltr. Mostly because nobody had a clue, and that included professional mechanics. The scenario went like this.
Travelling home last Feb. the motor suddenly lost power and started to miss something shocking. I managed to limp home , about 8klm in fits and starts . Local mechanic said it was fuel pump, I had a spare ,changed it . No change to miss problem. I bought a Haynes manual and it said if there was fuel in the return line the pressure reg. was faulty. Changed it . still had problem. Found a guy in Sydney who said it was probably Ignition Control module . I bought an exchange reconditioned and updated
( improved economy and power) for $125 ,exchange from him. Still had problem. I then changed the IAC, the Hall FX unit in the dizzy and the MAP sensor. All this time the ECU gave a 12 readout meaning there was no prob ?? which really confused the issue. I then acquired an ECU from a VN V6 ,changed the MEMCAL chip to the V8 and bingo Problem solved. All this time everyone had said the last thing that would need looking at would be the main computer. How wrong they were. l During this exercise I had checked all the relevant voltages and they all read as per specs.
My only minor prob. now is that recently the motor needs to wind a bit longer than I would like before it starts, but only when hot after a run . Starts instantly when cold. And the starter is fine. Maybe the battery voltage is a bit low when hot?.
Next job when I get around to it, is to rebuild T700R 4 tranny . it is a bit slow to move off when cold but is fine when hot. That will keep me busy for a while, but is a heap cheaper than giving it to a workshop.
