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Old 09-05-2019, 07:47 AM   #1
smoothdurban
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Default MAF (AMM) Woes and Q's

Over the summer I had finished up my LH2.4 Swap into my 83 242 and I used the MAF I pulled from a 91 740 donor (Bosch 0 280 212 016) I noticed that when I really got into the boost (10+ PSI) the car would lean out (AFR ~14) but if I progressively accelerated or held boost for longer it would get richer (AFR ~11.5)

I searched through the forums and found someone with a similar issue and they mentioned this phenomenon changed when they replaced the MAF.

Fortunately I had a spare cheapo fleebay MAF I bought for my 91 240 wagon as a spare so I plugged this thing in an viola! No more fluctuating AFR's under boost (AFR ~ 11.5 - 12)

Not wanting to rely on my cheapo MAF I spent the big bucks and bought one from FCP - an original Volvo one . . . . which is now made in China :(

I installed this into the car and it started to run poorly. It was pig rich at idle (ARF ~10) and under boost at 12- 15 PSI.

After diving the car for a while the idle AFR's did improve but the car seemed to perform better with my spare Fleebay MAF.

One of my questions is does the ECU relearn when a new MAF is installed? Should I have disconnected the battery before making the swap?

On a side note I am running wasted spark and sbabbs chips on the EZK and ECU and I do have a 3 bar FPR.

Thanks
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1983 242 Turbo w m46 142,000 km's B230FT LH2.4
1991 240 Wagon w m47 Winter DD 440,000 km's!
2005 S40i Sedan w M56 Summer DD with 140,000 km's

Last edited by smoothdurban; 09-05-2019 at 10:22 AM..
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Old 09-10-2019, 05:05 PM   #2
dl242gt
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I think the reset by removing the battery is a good idea. If it still acts weird I would get a warranty replacement.
The original AMM is a Bosch unit. So what you are writing is the Bosch unit is made in China or the replacement volvo one is no longer Bosch and is made in china?
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Old 09-10-2019, 05:11 PM   #3
smoothdurban
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The replacement (OE Volvo) unit is no longer bosch and it has a sticker on it which says it is a replacement for the 016 AMM with made in china on the sticker.
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Old 09-10-2019, 05:32 PM   #4
dl242gt
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Well at least it comes with the FCP warranty. Hopefully it will behave better with the reset.
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Old 09-10-2019, 08:25 PM   #5
Redwood Chair
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NOS NIB Bosch or genuine Bosch factory remanufactured exchange, everything else is garbage except perhaps the few OG ones that are still working since new.
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how psi stock cna support?


Last edited by Redwood Chair; 09-10-2019 at 08:35 PM..
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Old 09-14-2019, 07:40 PM   #6
smoothdurban
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Quote:
Originally Posted by dl242gt View Post
Well at least it comes with the FCP warranty. Hopefully it will behave better with the reset.
I tried the reset and it seemed to help. Afr's are low when cold but hit mid 14's after a minute or so of idling. I did a few WOT's and at around 16 - 17 PSI of boost I am seeing high 10's -low 11's AFR and heard no pinging nor did it feel like the engine was bogging.

Squawked the tires in second gear a few times too.

I am going to run with it for now.
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