Team,
Having some frustrating idle issues.
Engine is 1HDT. Issues started around 6 months ago with a bad idle shake. No noticeable drop in rpm. Shaking so bad that transfer lever moving side to side.
I undertook the following:
3000km later and the same symptom has just come back! Problem:
I just changed the filter head assembly and thought I had cured it but all if a sudden after 20min of driving it started again.
I'm basically ruling out an actual pump and injector problem. Last time you could crack an injector line and it would recover slightly and then shekels again.
I reckon it might be air... But a weird air problem.
Next steps if no luck will be to check pump timing again, but at this stage the biggest clue lies in what was changed for it to go away for a while... That is:
Wondering about tank change over solenoid or an old timer told me the nylon warning sensor in fuel filter can cause similar trouble without a leak being detected.
Having some frustrating idle issues.
Engine is 1HDT. Issues started around 6 months ago with a bad idle shake. No noticeable drop in rpm. Shaking so bad that transfer lever moving side to side.
I undertook the following:
- New engine mounts - no change
- Transfer case rebuild and mount - no change (had to do this to address a transfer issue that arose at the same time.
- Injector pump and injectors rebuild - probably the best shop in australia Nd had all the Denso mods done, new delivery valves etc. no expense spared.
- Valve clearances adjusted - thus was done while pimp was off. The problem was solved. We assumed it was pump as the previous rebuild was very poor they had used a 1HZ plunger spring and it had broken and passed through the pump
3000km later and the same symptom has just come back! Problem:
- Starts and runs ok
- Once hot and at idle for 10 seconds or so (sometimes longer) it will start shaking like crazy. It does not do it all the time, but it seems to get more consistent. A bit like an engine about to run out of fuel. If you give it the smallest amount of throttle for just a moment it will recover to smooth and the goes back to its shaking again.
- Idle is ~700rpm
- AC idle up ~750 rpm
- Even if you set hand throttle at 800rpm it will do the exact same thing.
I just changed the filter head assembly and thought I had cured it but all if a sudden after 20min of driving it started again.
I'm basically ruling out an actual pump and injector problem. Last time you could crack an injector line and it would recover slightly and then shekels again.
I reckon it might be air... But a weird air problem.
Next steps if no luck will be to check pump timing again, but at this stage the biggest clue lies in what was changed for it to go away for a while... That is:
- Inlet manifold came off and new gaskets
- Injection pipes off
- Valve clearances adjusted
- New fuel filter and hoses either side of primer pump
Wondering about tank change over solenoid or an old timer told me the nylon warning sensor in fuel filter can cause similar trouble without a leak being detected.