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Maf sensor 94 turbo drives fine disconnected!

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
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Maf sensor 94 turbo drives fine disconnected!

Postby Free2drive! » 14 Jul 2010, 09:15

Hello

Before spending out on a new maf, what do you think of this situation?

My 94 turbo drives fine with the maf sensor disconnected, it throws a code but when I reconnect the maf sensor and clear the code it drives no differently.

I thought when the mad was bad it would cause stumbling and stalling?

So is my maf bad?
Matt

Thanks
Matt
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Re: Maf sensor 94 turbo drives fine disconnected!

Postby jblackburn » 14 Jul 2010, 11:49

Clean the connector on both ends, and then re-fasten it with a zip tie and see if your code comes back.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


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Re: Maf sensor 94 turbo drives fine disconnected!

Postby pkc303 » 14 Jul 2010, 14:15

What code do you get?
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Re: Maf sensor 94 turbo drives fine disconnected!

Postby polskamafia mjl » 14 Jul 2010, 19:29

A bad MAF sensor will generally manifest itself by making the engine run poorly while it is plugged in, and making the engine run fine when it is unplugged. So from your description, your MAF sounds fine. But, as stated before, what code do you have?
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Re: Maf sensor 94 turbo drives fine disconnected!

Postby Free2drive! » 14 Jul 2010, 20:25

I'm getting code 1-2-1 from A2. If I reset the code and restart the car it revs up to 1500 then nearly stalls and instantly returns to 900 rpm. The car then drives fine with or without the MAF sensor connected.

Matt
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Re: Maf sensor 94 turbo drives fine disconnected!

Postby jblackburn » 14 Jul 2010, 20:47

Most likely you need a new sensor, but try pinching the connector on to it with your hand while someone else starts the car.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
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Re: Maf sensor 94 turbo drives fine disconnected!

Postby Free2drive! » 15 Jul 2010, 08:58

This is strange!

We swapped out the maf from a u-pull and the car drives like it's on steroids. Total difference and no codes. We took it from a 95 t5 90,000 miles.

Both the replacement maf and my old maf have different part no's!!!! Both are made by Bosch and both look identically except the new one has a larger aluminium block by the sensor strip.

As soon as it stops raining I'll get out and post both part no's.
Thanks
Matt
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Re: Maf sensor 94 turbo drives fine disconnected!

Postby jblackburn » 15 Jul 2010, 12:08

My guess would be that you have an early '94 model, which are a bit strange all by themselves. If the new sensor works OK, it is just an updated version - don't worry that they look slightly different.

I would reset the computer adaptives by pulling the battery cable and draining the charge (hit the brake pedal a few times) and let it re-learn the "right" way with the new sensor installed.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
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Re: Maf sensor 94 turbo drives fine disconnected!

Postby Free2drive! » 15 Jul 2010, 21:42

Thanks

I did disconnect the battery for a couple of hours before driving with the replacement MAF, it really is a different car. Much more power and go like my old 1997 T5.

Anyway, the part no of the MAF that I think is either faulty or the wrong one - 0 280 217 1073 507 697

The part no of the MAF that I pulled from a 95 T5 - 0 0280 217 1071 275 749

Both are made by Bosch.

Does anyone know the correct car for the first MAF?

Thanks
Matt
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