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Hard starting-air flow meter
Hi,
I have a ‘84 928 S. This summer I replaced some vacuum lines on the passenger side of the motor and the large round seal that goes between the air flow meter and the plenum. Before this the engine started very easily. Afterwards the engine would try to start but never quite got there. I went over all the vacuum lines multiple times and believe they are correct. I also checked to make sure I didn’t accidentally disconnect something in the engine bay. If I disconnect the connector to the air flow meter the engine starts but idles around 1800 rpm and is blowing a lot of smoke out of the rear. I figured that for some reason the air flow meter was bad so I got another one from 928 International. I connected the new one but no luck! I am really not sure what to do next. Some thoughts are: the connector to the air flow meter is bad. Before I mess with it is there a way to test the connector? Another thought is that the ECU is not reading the new air flow meter. Is that possible? Beyond that I am not sure what to do. If anyone has had this problem or have constructive (there are people on these sites that can be very rude and sarcastic) suggestions I would greatly appreciate it. Thank you and Happy Holidays! Tim Boyer Last edited by Tim Boyer; 12-15-2021 at 04:11 PM.. Reason: Highlight title |
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12-15-2021, 04:09 PM
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hey tim - when you say the connector is bad do you mean it's physically broken? - you could try doing a continuity test on each wire in the connector to see if they're actually connected - i also went through the vacuum lines and replaced that large seal this past summer - the result was the RPM's increasing a bit - i was thinking i might try adjusting the mixture screw - might be something you could try - my thinking is if i did seal up some small vacuum leaks the mixture, idle speed, and maybe even the distributor timing might be off a bit since it was originally set with those small leaks ocurring - although i wouldn't think they would stop the car from starting - i'm thinking the connector is your problem
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84 928 S - SOLD 2012 Cayenne S |
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12-16-2021, 07:30 AM
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Hi
The connector I am talking about physically connects the wiring harness to the air flow meter. It is not broken that I can see but it doesn’t lock in place like it should and it is so tight in that area that I am thinking I am just not getting a good connection. I am going to figure out how to run a continuity test on each wire to see what I get. Any suggestions on how I might do this? Tim |
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12-18-2021, 08:25 AM
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Thanks!
Would the removal of the MAF sensor effect the ECM? I have another MAF That is known to work so I will try it! |
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01-08-2022, 09:08 AM
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Kyle C
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Did you get this sorted?
To answer your question, no, removing the AFM temporarily should not affect the injection computer. Did you verify that the AFM "barn door flap" moves freely and does not stick at any point? If your AFM connector is indeed bad or not staying connected fully, I can point you towards a replacement. It will require cutting off the old connector and crimping on new terminals, but you will end up with a brand new connector with the quick-release (modern version of the original connector).
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1974 911 1978 928 5spd hillclimb special 1984 928S 5spd, 1986.5 928S auto 1983 944, 1984 944 track car 1995 Saab 900 S, 1997 Saab 900 Turbo, 1999 Saab 9-3 S |
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02-01-2022, 04:34 AM
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Opelousas,
Where would I get the connector you mention? PS-are there any relays or fuses that might effect the AFM? |
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03-08-2022, 02:07 PM
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