4A-GE MK1 Engine AFM question

toy-driver · 10-18-2007, 01:19 PM

I have a 87 na mr2. I am pretty sure my Air flow meter called it quits. My car ran rich and missed alot, things got worse and it won't even start. The plugs are soaked in gas and it smells like fuel. The only way i can get it to start is flooring it.
That being said, what is the difference is the 85-86 afm and the 87-89? The part numbers are different, and the air box mounts directly to the 85-86. Other than that is there any other difference? I can get a 85-86 rebuilt afm for less than half of a 87+. Can I use a earlier model afm on my 87? Thanks guys

Mista 2 · 10-19-2007, 06:04 AM

85-86 use MAP sensors not AFM's

toy-driver · 10-20-2007, 03:10 PM

Um, no. Maybe just in the US, but they are AFMs. MAP sensors are newer and better.

Mista 2 · 10-21-2007, 03:26 AM

Phil Bradshaw's home page
this is where i got a lot of info from

toy-driver · 10-21-2007, 07:55 PM

It says the 83-87.5 is ether MAP or AFM. What I stated, I need to know if the 85-86 AFM is the same internally as the 87-89 AFM. Can somebody be help me?

sliverstorm · 10-22-2007, 10:34 AM

I could have sworn all US 4age's in the MR2 use AFM. Only MAP sensored one being the Geo Prizm. I suggest you read the manual for pre 87 and 87+ to compare specs and pictures. pretty sure they'll be the same though. I guess ultimate thing saying they are the same would be if part # is the same. look that up.

toy-driver · 10-23-2007, 05:18 PM

They look slightly different and the part number are different.

10-18-2007, 01:19 PM	#1 (permalink)
toy-driver Getting there Join Date: Oct 2007 Location: Dallas, TX Posts: 282 Thanks: 3 Thanked 11 Times in 11 Posts iTrader Rating: (3/100% )	AFM question I have a 87 na mr2. I am pretty sure my Air flow meter called it quits. My car ran rich and missed alot, things got worse and it won't even start. The plugs are soaked in gas and it smells like fuel. The only way i can get it to start is flooring it. That being said, what is the difference is the 85-86 afm and the 87-89? The part numbers are different, and the air box mounts directly to the 85-86. Other than that is there any other difference? I can get a 85-86 rebuilt afm for less than half of a 87+. Can I use a earlier model afm on my 87? Thanks guys

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10-19-2007, 06:04 AM	#2 (permalink)
Mista 2 Cage Fighter Join Date: Nov 2006 Location: Adelaide, Australia Posts: 463 Thanks: 16 Thanked 21 Times in 21 Posts My Google Map iTrader Rating: (0/0% )	85-86 use MAP sensors not AFM's

10-20-2007, 03:10 PM	#3 (permalink)
toy-driver Getting there Join Date: Oct 2007 Location: Dallas, TX Posts: 282 Thanks: 3 Thanked 11 Times in 11 Posts iTrader Rating: (3/100% )	Um, no. Maybe just in the US, but they are AFMs. MAP sensors are newer and better.

10-21-2007, 03:26 AM	#4 (permalink)
Mista 2 Cage Fighter Join Date: Nov 2006 Location: Adelaide, Australia Posts: 463 Thanks: 16 Thanked 21 Times in 21 Posts My Google Map iTrader Rating: (0/0% )	Phil Bradshaw's home page this is where i got a lot of info from

10-21-2007, 07:55 PM	#5 (permalink)
toy-driver Getting there Join Date: Oct 2007 Location: Dallas, TX Posts: 282 Thanks: 3 Thanked 11 Times in 11 Posts iTrader Rating: (3/100% )	It says the 83-87.5 is ether MAP or AFM. What I stated, I need to know if the 85-86 AFM is the same internally as the 87-89 AFM. Can somebody be help me?

10-22-2007, 10:34 AM	#6 (permalink)
sliverstorm Tinkerer extrordanaire Join Date: Sep 2007 Location: California Posts: 87 Thanks: 0 Thanked 3 Times in 3 Posts iTrader Rating: (0/0% )	I could have sworn all US 4age's in the MR2 use AFM. Only MAP sensored one being the Geo Prizm. I suggest you read the manual for pre 87 and 87+ to compare specs and pictures. pretty sure they'll be the same though. I guess ultimate thing saying they are the same would be if part # is the same. look that up.

10-23-2007, 05:18 PM	#7 (permalink)
toy-driver Getting there Join Date: Oct 2007 Location: Dallas, TX Posts: 282 Thanks: 3 Thanked 11 Times in 11 Posts iTrader Rating: (3/100% )	They look slightly different and the part number are different.