I have had my 85 FJ60 for 24 years and have gone through just about everything in that time, suspension, engine rebuild, 5 speed, body work... It was time for California smog again and for the last few years the truck has not gotten a lot of use so I went through the usual checklist of timing, vacuum, idle speed before taking a quick freeway lap on the way to the test center. About 20 minutes into the drive I pulled off the freeway to top off the tank and it immediately stalled. It started right away but I had to use the hand throttle to keep it running (1500 rpm min), I limped home and popped the hood and it all looks normal. Then I got a bit more serious:
fluids -fine
vacuum - extremely low, under 10in at over 1000 rpm
plugs - #1 was fouled, # 6 was marginal
compression , 1-6 - 128, 128, 125, 127, 131, 65
I replaced the plugs but that did not make a difference and i am having a hard time seeing the low compression on cylinder 6 causing the low vacuum. My next step was to try and narrow down the vacuum leak. Before the drive is was over 18 and steady so I started disconnecting and plugging every system that could be leaking, PCV, brake booster, EGR... no change.
I feel like the next step is to pull the carb and look for a crack in the intake manifold but want to make sure I don't miss testing something before I can no longer start it.
Thoughts?
My guesses are:
1. intake manifold
2. intake manifold gasket
3. head gasket
4. Head?
What is odd to me is it ran like top and then instantly did not so seems like a break / crack
A little over 100k since the stock 2F rebuild.
Thanks for any advice.
fluids -fine
vacuum - extremely low, under 10in at over 1000 rpm
plugs - #1 was fouled, # 6 was marginal
compression , 1-6 - 128, 128, 125, 127, 131, 65
I replaced the plugs but that did not make a difference and i am having a hard time seeing the low compression on cylinder 6 causing the low vacuum. My next step was to try and narrow down the vacuum leak. Before the drive is was over 18 and steady so I started disconnecting and plugging every system that could be leaking, PCV, brake booster, EGR... no change.
I feel like the next step is to pull the carb and look for a crack in the intake manifold but want to make sure I don't miss testing something before I can no longer start it.
Thoughts?
My guesses are:
1. intake manifold
2. intake manifold gasket
3. head gasket
4. Head?
What is odd to me is it ran like top and then instantly did not so seems like a break / crack
A little over 100k since the stock 2F rebuild.
Thanks for any advice.