So, I have been chasing a problem with my 1987 240 GL for about a week. She was having some real trouble staying running once she started... ran for about 3 seconds! Checked the fuel pump fuses, replaced plugs, cap, rotor, and wires. Was just about ready to call the shop, when I read a post about a similar problem which others pointed to the AMM.

Came home, went out to the beast and unplugged the AMM and she started right up and stayed running. This was a HUGE improvment. Couldn't drive it anywhere, of course. Putting it in gear and giving it some gas promptly killed it.

So, unless someone else has a better idea ~ and I am open to suggestions and advice ~ I think I am replacing an AMM real soon now.

Couple of questions...

1) Is this just a parts swap or is this something which must be calibarated or adjusted once installed?

2) Is it better to just bite the bullet and buy a new one or is this something to check the boneyard or parts puller for?

3) seems like a pretty easy part to replace - any caveats, warnings or advice?

4) what causes a part like this to fail - Age or something else to look at? (note, the car has 130K on it...)

Thanks to all, in advance!

No so fast. I had a similar situation and it turned out to be the fuel pressure regulator, not the AMM. Be sure to do the two ohm meter tests. Mine would run but blow clouds of black smoke out the back.

Mike in Tacoma

Mine won't run; unless the AMM is unplugged.

rdb

To add a little more info, I know that the fuel mixture adjustment screw is in the AMM. The AMM should be plug and play, with no adjustments needed to run like new again but if you fail your next SMOG or if you are bored you might consider checking the fuel mixture setting via Bentley's instructions with a light or a dwell meter.

I am probably bringing up something that will have no effect but just in case I thought I might bring it up. If anyone has info like, all AMM are factory set at the manufacturer and never need adjusting then this would probably void my comment altogether.

I just had my AMM fail last week. It must be the Season of the Witch....... Or just plain age. These things seem to go out from age, not useage or miles. The symtoms were erratic cruise, missing at full throttle, but checked out fine at idle. My wagon has 255k on it and after 15 yrs, and yours now 17 yrs, you should treat yourself to a good one. When you make a decision to get new or used one, the word out there is that the aftermarket ones are garbage, and the rebuilt Bosch at over $220, not worth the expense, time and hassle after shipping and core charge, and shipping the old one back.
A good used one will run better than an aftermarket one, but remember it's still at least 16 yrs old since the 007 was replaced by the 016 which I have.
What did I do? I went to the Volvo dealer and got a Volvo/Bosch re-built. After using my Volvo for Life coupons, it was $260 out the door, and the swap was done in 5 minutes in the parking lot. If you intend on driving it for a long while to come, this is what I would reccomend.
--
'89 245 Sportwagon, '96 960 sedan

The only other suggestion I have is to make sure the electrical contacts on your current AMM are clean. Often, bad contacts are the cause of a "malfunctioning" AMM.

-dave

1) Yup it sure sounds like the AMM. Easy swap. No adjustment needed.

2) Get one at your local boneyard or on ebay. Don't waste your money on a new one. They are quite pricey.

3) One caveat... make sure ignition is OFF when plugging/unplugging the AMM or you may cause damage.

4) Not sure why they fail, but it is fairly common and they typically fail without any warning.. It is a good idea to carry a spare. Make sure you use the right part number (has 007 in the number).
--
Greg P. 1988 240 DL 'Olga' 170,000 miles

hey rdb-

i just had THE EXACT SAME PROBLEM this weekend!!! (i posted about it earlier today if you want to look)

similar consensus from the replies to my post that the AMM is a quick 5 minute swap. you can get them used on ebay for about $40, which is what i just did this evening. this was a recommended place to purchase them by 2 people. good idea to pick up a spare too while you are at it.

good luck-
kathryn

Yes, your message was the trigger. I read your message, it all clicked.

thanks!

rdb

It's a plug-and-play swap, no adjustment necessary. The AMM can fail if the airbox thermostat sticks, it can fail from a backfire, or just fail for no apparent reason.

BTW, I have an unused rebuilt "007" AMM for sale if you want it. I actually have it and 2 used ones, if you want to pick up a spare. I never go anywhere without a spare AMM after that breakdown 1000 miles form home a few years ago...

Email me at clbolt (at) prodigy (dot) net if you're interested.
--
1991 245, 61k miles, looking for a 5 speed 92-93 245 cheap.