Boost gauge goes straight to max when ignition is turned on

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Boost gauge goes straight to max when ignition is turned on

Postby danbrown100 » Wed 14.10.2015, 15:11

Any ideas what I need to check and in what order please chaps?

Thanks from a newbie!

991 Elan SE 54,000 miles
Milford PA - 70 miles NE of NYC
1991 Elan SE, 54k miles, needs some TLC
1995 Audi A6 Avant, will outlive all of us!
1973 BMW 2002 Touring, currently off the road
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Re: Boost gauge goes straight to max when ignition is turned

Postby Elannewbie » Wed 14.10.2015, 16:05

Check the boost transducer/boost sender unit earth.

The unit is situated on the left hand side of the engine bay (as you look at the engine from the front with the bonnet up) on the front of the left hand suspension turret. One wire will attach to the unit and the other to a spade terminal that is under one of the mounting screws.

I had the exact same problem, turned out the earthing lead and screw were loose, I cleaned the spade terminal and its mating face on the bracket with a bit of wet and dry abrasive paper and tightened it all up - problem solved.

I hope you have the same problem and that this answer will help/fix.

Kind regards

Grahame.
Black S2 #073 "it's only metal - it cannot win!"
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Re: Boost gauge goes straight to max when ignition is turned

Postby danbrown100 » Wed 14.10.2015, 16:08

Thanks Grahame, I will give it a go!

Dan
Milford PA - 70 miles NE of NYC
1991 Elan SE, 54k miles, needs some TLC
1995 Audi A6 Avant, will outlive all of us!
1973 BMW 2002 Touring, currently off the road
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Re: Boost gauge goes straight to max when ignition is turned

Postby lotusflasherman » Thu 15.10.2015, 01:28

I posted this when it happened to me....httpforum.lotuselancentral.com/viewtopic.php?f=31&t=24504
Phil

Leave me alone, I think I know what I'm doing.
Cars: Subaru Forester 2.5XTN, Eclat Riviera, brace of Pacific Blue SE's, Collapso SE, Elan+S.... and now an Evora
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Re: Boost gauge goes straight to max when ignition is turned

Postby danbrown100 » Mon 19.10.2015, 15:09

Hmm, of course not as straightforward a fix as I had hoped! The previous owner had helpfully disconnected both wires from the boost sensor and also the boost sensor from the bulkhead. Please could you confirm which terminal on the boost sensor I should attach the smaller connector to and confirm that the black wire is the earth?
Milford PA - 70 miles NE of NYC
1991 Elan SE, 54k miles, needs some TLC
1995 Audi A6 Avant, will outlive all of us!
1973 BMW 2002 Touring, currently off the road
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Re: Boost gauge goes straight to max when ignition is turned

Postby Elannewbie » Tue 20.10.2015, 18:31

The black wire is the earth and should be mounted under one of the screws that attaches the transducer mounting bracket to the body work. The other wire (which is green on my car) should attach to the transducer itself at the opposite end to the rubber hose that goes off to the plenum chamber ( the bit with "DOHC" on it).

If you have a look at Lotusflasherman's post there is a picture of the transducer and hopefully it will make sense.

Kind regards

Grahame.
Black S2 #073 "it's only metal - it cannot win!"
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Re: Boost gauge goes straight to max when ignition is turned

Postby danbrown100 » Mon 26.10.2015, 18:47

Thanks guys - I got it working at the weekend, so now I have a moving gauge to see how heavy footed I am being!
Milford PA - 70 miles NE of NYC
1991 Elan SE, 54k miles, needs some TLC
1995 Audi A6 Avant, will outlive all of us!
1973 BMW 2002 Touring, currently off the road
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