Hi everyone

I have a 94 7.5 OBS with weird issue.
No one can figure it out. It was at the last shop for 6 months before they gave up.
Starts, runs, revs great in Park. But in Drive it struggles to go.
Any ideas or best OSB mechanics in Greater Vancouver BC ?

Thank you
Adam

 

Base engine concern
Compression test
Cylinder balance test
State of tune, plugs and wireset, cap and rotor (including timed correctly with the spout out)
Double check all of that
Vancouver, BC you say
460 near sea level should run like a raped ape

 

I read the list to the shop - Other then cylinder test all was well
he asked I remove it from his shop
will have to start over with next shop
wish you were local 007
thanks

 

How old is your gas?

 

Fresh, gone thru several fills since problem began, revs great in Park.

None the less I changed inline filters and blew the lines; no resistance. pump works great.

One tank doesn't work, but this was never an issue, just annoying.

I changed thermostat, MAP sensor,

I scanned it - no error codes

It drive fine for a minute before stalling, but back in Park, and it's fine again like nothing was the matter.

Could overheating issue? After a short rest, it can drive another short distance. the cooler it is the further it will go.

Thanks a million

 

Ignition Control Module, burnt out brake light bulb or temp sensor is where I'd look.

 

Have you checked your fuel pressure?

 

This was the first thing I asked my current mechanic to check - He said it was good

Thanks

 

If the fuel pressure is good, the next thing I would check is the timing and the spark plug wires
Borrow a light from Autozone or some other parts house and check it yourself

 

If you do not have access to a light and you are 800 miles from a parts store
Crank that distributor around a bit, to add some timing, and then recheck the drivability
I always look down at the factory timed chisel mark on the distributor and the block (to see if it has been messed with)
Most of the time, if I have to re-time one and I do it. I then re-inspect the chisel mark, only to find that they are now lined up
So, for sheets and grins, check those marks

 

How many times have we seen the same response from a "mechanic", but turns out to be bad advice.

You need empirical numbers, not a verbal response. Invest in a few tools so you can diagnose this yourself. Otherwise the wallet biopsy will continue.