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GaryR GaryR is offline
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Join Date: Mar 2005
Location: Valencia, Spain
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Weird Boost gauge reading and engine cut-out

My 82's OEM boost gauge is reading wacky and the engine cuts out as soon as I hit 3500 RPM. So far, per the manual, i've run a few tests.

Unplug the wire from the charge pressure sending unit, turn on ignition and it pegs the gauge. Ground the wire and the gauge drops to zero. If I plug it into the sending unit w/ignition on it goes to .25Bar (engine off).

Wastegate - Pulled the air line and at idle your supposed to feel vacuum, I can't feel anything. Hose is new, maybe its just me. Didn't have anyone to hit the gas so cant say if pressure turned positive at higher revs. I put 20 PSI into the wastegate with the engine idleing and it opened up just fine so I assume all is well there.

I removed the OB switch wire and grounded it, took the car for a ride. 3500 RPM seems to be when i'm at REALLY good boost. If she had wings I swear she would have went airborne! No hesitation, ran smooth as silk to redline in 2nd.

My assumption is the boost sending unit is crap at this point, would like to hear of other tests or opinions.

Thanks for any input..

One other thing, what air line goes on the stock air cleaner over on the left side (about a 3/4" nipple there)?

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Gary R.
Old 04-29-2007, 12:19 PM
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