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B230FT Gagging Part 2
The stubborn gremlin reported by the previous owner comes and goes.
The engine went back into gagging mode running very rough.
I didn't bother to road test, and give Porkface 2 points for not
believing the CPS was the culprit.
I'd like to have a scope on the CPS while the engine was gagging though.
The CPS sensor has two wires from the coil and a shield that's not
grounded to the transmission bell housing. Maybe severe engine hash
can upset the RPM counter at the ignition ECU triggering
this random failure that the previous owner had on his list
of unsolved problems. Which makes me wonder about thirty
year old capacitors in the ECU's again.
Opening the air box to get a look at the MAF sensor
I found this pile of old tape and hunks of foam inside.
What is that wobbly item that looks in need of tightening?
Cleaned the old tape/foam debris from the airbox.
Here's some of it.
Surprise, the stainless steel screen on the Turbo side of the MAF
was gone with a few strands remaining that I removed.
Then I found that a screen from a 740 MAF is identical
and replaced
Then serviced the MAF connectors that looked terrible.
I was out of Deoxit., used a little silicone spray and scrubbed
with a stiff toothbrush then blew out with air, and repeat.
Then a small smear of dielectric silicone.
Back to the car to blow out the air box and
found this piece of wire from the screen sitting in the air duct
to the turbo. UGH!
For good luck, serviced the two ground connections at the intake manifold
Then the car started and ran smooth.
Is it fixed? I won't bet the ranch on it. Stand by for chapter 3
Bill
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