Hi all,
This is my first post here after buying my first LandCruiser. "Hoff" is 1986 fj62 with 330k and gas conversion. Only "major" thing that I had to do to the car was replace the radiator which was badly rusted. Car seemed to do really well for a couple of 2000 km trips.
Then one morning truck started missfiring. Not sure how to really explain the misfiring but I hear a loud bang from the engine and compression vanished for a fraction of a second. Took Hoff to Toyota and they tuned the engine and did compression test and found that 3rd cylinder had low compression (no figures), with possible burnt valve... I was also told of no vacuum to distributor, suspect hole in vacuum advance diaphram and carby needing overhaul. They put oil in #3 cylinder and car seemed to be fine, in fact better than ever before (probably because of being tuned), burning off all similar cruisers. I thought nothing of other stuff as truck worked well.
Then, during third big trip, the waterpump had to be changed. It had hole in it from no doubt the rust that got inside from the rusty radiator. After the waterpump was changed we drove another 500km and engine started similar type missfiring, maybe did it 5 times in total over teh 500km (like back-firing but but loud bang from front, so probably actually prefiring!?). Bangs were so loud that felt like they would do deffo some damage. When I looked under the hood, I could only spot air filter case lid open. Now back at city it has increased the misfiring. Today, when I was taking Hoff back to Toyota it did misfire 3 timer in row like a machinegun. At toyota they guessed that it is the 3rd, but would like to do flood test etc. first to get better idea. It does the firing always between 1000-1500 revs. Also, I dont get the loud bangs when I am on pertol, only on gas. On petrol it simply misses and jerks the car. When I cold start, I need to get it very warm before driving on petrol, less warm with gas. I dont drive on gas any more becaus bangs are very loud and sound damaging. And one more thing, it seems to also miss when I slow down with gear on.
Where do I start? Would like to start with the vacuum advance diaphram? Is that easy chance. How about carby overhaul? can I do that myself easily? Is it necessary? Or can you confirm my nightmare scenario of it definitely being valve problems?? I know many questions, but I would really try fix there problems before taking it back to Toyota...
Thanks for reading
This is my first post here after buying my first LandCruiser. "Hoff" is 1986 fj62 with 330k and gas conversion. Only "major" thing that I had to do to the car was replace the radiator which was badly rusted. Car seemed to do really well for a couple of 2000 km trips.
Then one morning truck started missfiring. Not sure how to really explain the misfiring but I hear a loud bang from the engine and compression vanished for a fraction of a second. Took Hoff to Toyota and they tuned the engine and did compression test and found that 3rd cylinder had low compression (no figures), with possible burnt valve... I was also told of no vacuum to distributor, suspect hole in vacuum advance diaphram and carby needing overhaul. They put oil in #3 cylinder and car seemed to be fine, in fact better than ever before (probably because of being tuned), burning off all similar cruisers. I thought nothing of other stuff as truck worked well.
Then, during third big trip, the waterpump had to be changed. It had hole in it from no doubt the rust that got inside from the rusty radiator. After the waterpump was changed we drove another 500km and engine started similar type missfiring, maybe did it 5 times in total over teh 500km (like back-firing but but loud bang from front, so probably actually prefiring!?). Bangs were so loud that felt like they would do deffo some damage. When I looked under the hood, I could only spot air filter case lid open. Now back at city it has increased the misfiring. Today, when I was taking Hoff back to Toyota it did misfire 3 timer in row like a machinegun. At toyota they guessed that it is the 3rd, but would like to do flood test etc. first to get better idea. It does the firing always between 1000-1500 revs. Also, I dont get the loud bangs when I am on pertol, only on gas. On petrol it simply misses and jerks the car. When I cold start, I need to get it very warm before driving on petrol, less warm with gas. I dont drive on gas any more becaus bangs are very loud and sound damaging. And one more thing, it seems to also miss when I slow down with gear on.
Where do I start? Would like to start with the vacuum advance diaphram? Is that easy chance. How about carby overhaul? can I do that myself easily? Is it necessary? Or can you confirm my nightmare scenario of it definitely being valve problems?? I know many questions, but I would really try fix there problems before taking it back to Toyota...
Thanks for reading
