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Newbie with a gm mas and translator


JohnnyWadd
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Hey everyone i finally got into the gm mas game. I have a car i am trying to get running. Its running very rich. Just saying hi and posting up what i have in hopes for some quick help.

The mas install was done by previous owner and was said to have ran great at one time.

 

So far it looks like the ignion system is good, timing is right, wires and plugs and good, vac advance is good, coil is new upgrade, no vacum leaks...good compression. Car barely runs and idles like a v8 with a big cam. It will start right up but dies under throttle.

Also weird it will idle with an injector disconnected better than if connected and will idle with either injector connected (maybe one is leaking enought to let it idle becuase i thought the 1989's secondary didnt come on till boost

Car has a narrow band AFM that shows 18 plus at idle

Anyway here is what i have...

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-11115202.jpg

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-11115225.jpg

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-11113830.jpg

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-11114009.jpg

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-11074051.jpg

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-11115317.jpg

Edited by JohnnyWadd
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Edit, your picture shows a wide band gauge. Try turning the idle knob to the right.. But it sounds like there is something wrong you will not be able to tune around.

 

I got it to idle doing that. afr down to 12's. Now it has enough power to move. The wideband guage is there but i only see a stock oxygen sensor.

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Did you look underneath and along the down pipe? Sounds like the wide band is working. Repeat the tests with disconnecting the injectors and see if it effects the idle? It should idle the same with the secondary disconnected. But will stumble if you kick the gas pedal. Disconnecting the primary it should promptly stall at idle.
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Did you look underneath and along the down pipe? Sounds like the wide band is working. Repeat the tests with disconnecting the injectors and see if it effects the idle? It should idle the same with the secondary disconnected. But will stumble if you kick the gas pedal. Disconnecting the primary it should promptly stall at idle.

 

It stalls but takes a while and idles best with just the green injector plugged in. Unplugging the black injector instantly cleans up the idle. Plugging it back in almost make it stall. :(

Cleaning the injectors i noticed my green injector is a "Python"

And it does have a wideband downstream of the downpipe.

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sounds like its running on a 86 ecu feeding both injectors lol

 

I thought that too. ECU is a 0197 part number i checked.

I was reading the threads and looking at the wiring thinking somehting could have been wired wrong making the injectors both fire. All seems right thoug.

Edited by JohnnyWadd
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I thought that too. ECU is a 0197 part number i checked.

I was reading the threads and looking at the wiring thinking somehting could have been wired wrong making the injectors both fire. All seems right thoug.

check and make sure build is a 87 or newer, i think 87 ecu casing is the same as 86 and older, possible 86 internals?

 

jump your fuel pump tester connector with the OVCP off, and check the injectors, slowly pinch the return fuel like with pliers, and see if you have any leaks

 

also, google the part number on the pythons and see what size they are. i think they are the "reman" injectors summit sells for our car, like the python maf

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check and make sure build is a 87 or newer, i think 87 ecu casing is the same as 86 and older, possible 86 internals?

 

jump your fuel pump tester connector with the OVCP off, and check the injectors, slowly pinch the return fuel like with pliers, and see if you have any leaks

 

also, google the part number on the pythons and see what size they are. i think they are the "reman" injectors summit sells for our car, like the python maf

 

ECU part number is a 88 or 89. I signed the light in there and didnt get any drips.

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check and make sure build is a 87 or newer, i think 87 ecu casing is the same as 86 and older, possible 86 internals?

 

 

 

MD120197 is a 88/89 ECU.

 

1987 year models came with these ECU numbers:MD106394,MD111820,MD084852,MD071084.

1986 year model ECUs: MD110007,MD101177,MD090798,MD110005,MD101175.MD110006,MD101176.

 

1986 ECUs:

MD110007: 5-Speed, ESI. 2/86 to 5/86.

MD101177: 5-Speed, ESI. 10/85 to 1/86.

MD090798: 5-Speed, ESI. ----- to 9/85.

MD110005: 5-Speed, LE. 2/86 to 5/86.

MD101175: 5-Speed, LE. 6/85 to 1/86.

MD110006: Auto, LE. 2/86 to 5/86.

MD101176: 5-Speed, LE. 6/85 to 1/86

 

I987 ECUs:

MD106394: 5-Speed,ESI. 6/86 to 5/87

MD111820: 5-Speed/Auto, LE. 6/86 to 5/87

MD084852: 5-Speed, ES,LS,LE.3/84 to-----.

MD071084: 5-Speed, ES,LS,LE.6/83 to2/84.

 

 

Bill

Edited by Caliber308
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No :(

 

just throwing the simple things out there---u said in post that wires/plugs are good so fouled plugs is out----looks like u should have kept a couple injectors to swap out for testing purposes---there is a green bulb and a red bulb on the translator---the green should be dimly lit when at idle i belive---if the translator sees an issue the red lite blinks----is that happening?

gig out

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Here is my mas..

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-12160837.jpg

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-12160704.jpg

 

I lied about the plugs. Going of the old bosch plugs from the PO i thought plugs where good. Pulled out these autolights ...

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-12154216.jpg

 

That prompted a compression check with 90 psi cold on 3 , with #4 making 95 psi. I should have went through it before blaming my maf/translator. When running pulling the plug wires off 1 or 4 make no change in idle.

Edited by JohnnyWadd
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Okay, I did a little research, that's a newer style plastic Delphi MAF: http://ls1tech.com/forums/pcm-diagnostics-tuning/1515344-new-delphi-ls1-maf-design.html

 

I would recommend picking up one of the older style Delco MAFs pictured above, since that's what the translator was designed to work with.

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"that's the part number of the 3.5" sensor. I just checked it against one I have here."-->http://www.fullthrot...p?t=6177&page=2

 

Is your MAFT set to 3.5" GM MAF?

 

I dont know what the settings are for 3.5 gm maf. It started out with the settings in this pic...

http://i1187.photobucket.com/albums/z388/starionkiller/1989%20conquest/th_2012-12-11115202.jpg

 

With those settings^^^ i was at 18 afr at idle. I adjusted them based on the pinned threads we have on the translator and got 11 or 12 at idle.

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