1992 940 turbo wont start -Air intake hose problem?

[TomR]

My 1992 940 turbo wont start after some minor maintenance. While
working on my 940 I noticed the bottom of my air supply hose was kind
of thin and creased along the bottom. I could not see if there was a
hole in it or not. This is the hose that goes from the air cleaner
box, through the AMM and connects to the what I believe is the
wastegate. I didnt have a hose to replace it so I taped it up the best
I could. After finishing this, my car will not start. I've tried
cleaning and reconnecting the electrical connection that plugs into the
AMM and the other one near it but this hasn't helped.

Any ideas what could have gone wrong here?

Thanks,
Tom

 

[James Sweet]

My 1992 940 turbo wont start after some minor maintenance. While
working on my 940 I noticed the bottom of my air supply hose was kind
of thin and creased along the bottom. I could not see if there was a
hole in it or not. This is the hose that goes from the air cleaner
box, through the AMM and connects to the what I believe is the
wastegate. I didnt have a hose to replace it so I taped it up the best
I could. After finishing this, my car will not start. I've tried
cleaning and reconnecting the electrical connection that plugs into the
AMM and the other one near it but this hasn't helped.

Any ideas what could have gone wrong here?

Thanks,
Tom

The wastegate is on the exhaust pipe side of the turbo, the hose you're
describing sounds like the one that goes to the intercooler which is a
large radiator looking thing. Are you sure you hooked all the hoses back
up where they went?

 

[tom.dave]

The hose you're speaking of is the intake hose to the turbo. Its common
for it to turn to mush at the spot around where the smaller hose from
the oil separator connects to it. Taping it up should not affect
starting so its got to be something else. Does it crank? Are you sure
its back on correct and securely? If you didn't put it back on right
and have a big vacuum leak it could prevent it from starting.

Dave

 

[TomR]

It is the intake hose to the turbo. After closer inspection I found a
tear in the hose where the other line (oil seperator?) goes in. I
taped everything up and made sure it's all connected properly. I never
took it off. I did take the vacuum line that goes from the turbo to
the intake manifold off and try to replace it. I couldnt find another
so I put it back on. It's worn but seems to be ok otherwise. The
engine does crank and runs very rough or not at all.

Thanks for the input. Any other ideas?

 

[Michael Pardee]

It is the intake hose to the turbo. After closer inspection I found a
tear in the hose where the other line (oil seperator?) goes in. I
taped everything up and made sure it's all connected properly. I never
took it off. I did take the vacuum line that goes from the turbo to
the intake manifold off and try to replace it. I couldnt find another
so I put it back on. It's worn but seems to be ok otherwise. The
engine does crank and runs very rough or not at all.

Thanks for the input. Any other ideas?

Hmm... it would help to know if the problem is spark or fuel. Can you spray
a blast of starting fluid in the air cleaner and see if the engine goes
"vroom?"

Mike

 

[TomR]

Mike -
That sounds like a good idea. Especially since I don't know what else
to do! The air intake system looks pretty tight. Do you think I
should remove the top of the air cleaner and just fire away with the
starting fluid or is there a better place to spray it. Perhaps
disconnect the air inlet from the AMM maybe? I'll let you know if it
works after I get some starting fluid.
Thanks for the input.
Tom

 

[Michael Pardee]

Mike -
That sounds like a good idea. Especially since I don't know what else
to do! The air intake system looks pretty tight. Do you think I
should remove the top of the air cleaner and just fire away with the
starting fluid or is there a better place to spray it. Perhaps
disconnect the air inlet from the AMM maybe? I'll let you know if it
works after I get some starting fluid.
Thanks for the input.
Tom

I usually lift the top of the air cleaner and spray a few second's worth
onto the filter, then close it back up.

Mike

 

[TomR]

Tried the starter fluid but it was no help. Disconnected the AMM
connection and engine still would not start. Checked and I do have a
spark and the plugs are wet.

Took the throttle body intake hose off and engine started but ran
lousy. Not sure if this was such a good idea but while the engine was
running I disconnected the AMM connector and the engine died instantly.

Any idea how to diagnose the AMM to see if it is good or not? Could the
idle control valve, a vacuum leak or the o2 sensor cause this?
Thanks for the help.

 

[TomR]

Not sure what I did but it's running now. Poked, prodded, and checked
a lot of different things and the car runs fine now. Cleaning the AMM
may have helped the most. When I took it off and looked inside,
something fell out. It looked like a small piece of wire so I thought
the element had broken and that was the cause of the engine not
starting. Turns out it was a very small twig. It got inside the AMM
somehow and perhaps was resting on the wire element inside. ........I
don't know but the engine runs fine now.