If I remove the 9th injector on an 86 MAF car will there be any issues with the prom?
Throw codes? Will it hurt driveability?

I hate the black plume when i start my car.

thanks!

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

Yes, you need a Memcal from an 1989 TPI car (for limp mode) and the programming of the BIN. As bins go, the ARAP.BIN for the 89 MAF car is probably the best starting point for a MAF car.

But you must also get the Memcal, so if you get an SES code and go into "limp mode", then your car will still run. If you disconnect the cold start injector and do not use an 89 Memcal, you may not be able to start you car in Limp Mode, even if you burn the ARAP.BIN onto your Memecal.

Also, you will need to have an 86-89 ECM. You cannot make the 89 Memcal/BIN work on your 85 ECM. So, unless you are willing to convert, leave the cold start injector as is.

 

Nah, you can disconnect it w/out any problems. Did so myself when I had started burning my own proms just to see if it'd affect anything when the engine was cold and warming up. This injector is only controlled by a temp sensor in the front of the intake and the computer doesn't even know it's there (or not), so no codes will be thrown. You'll run a little lean until the engine is close to warmed up (maybe abot 120 degrees F), but you'll be hard-pressed to notice the difference.

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Greg Westphal
'87 IROC 355TPI/A4

 

Greg, I think you are misinterpreting what I am saying. I am not saying, disconnecting the 9th injector will cause an SES code. I am saying IF you get an SES code for SOME OTHER REASON, the 87 Memcal is from the wrong car and it may not start properly because the circuitry on the Memcal is designed around the 87 (with a cold start injector). Your 87 Memcal will not have the proper "limp mode" to start without the 9th injector connected.

 

Ahhhh, I see. However, I'm running an '87 350 memcal with a modified ARAP bin and I've been able to start it up while in limp-home mode. The cold-start injector doesn't really have anything to do with starting up per se, just adding additional fuel when the engine's cold.

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Greg Westphal
'87 IROC 355TPI/A4

 

My 87 would not start at all, warm or cold without the cold start injector (CSI). It might be becasue my car is weird or something, but its the truth.

It does NOT hurt anyting to try it, unplug the 9th injector, see if it will start. just don't burn up your starter by cranking and cranking and cranking.

And NO it will not throw any codes, before I went to ARAP, I unplugged my CSI just to see, and there was nothing. The ECM really wouldn't notice a lean condition until it got up to closed loop anyway because the way Inderstand it is the readings from the O2 Sensor aare pretty much ignored until it gets into closed loop.

Correct me if I am wrong, the CSI is just for starting anyway, and does not function once the car is running.

If your getting puffs of black smoke, sounds more like leaking injectors, mine never smoked with the CSI pluged or unpluged

John

 

Limp Home?
That means the processor is dead.
There is a difference from that to fail soft mode

 

Yep, limp-home mode, due to a faulty solder connection on my ZIF socket. I've had the soft fail mode too due to a bad MAF relay, and once to an unplugged MAF sensor, and this was totally different, fitting your description to a T.

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Greg Westphal
'87 IROC 355TPI/A4

 

Limp Home, is when the prosessor is dead. In which case you run on the redundant fuel devise, with fixed timing.

Unplugging anything, and the ecm uses default values, and continues.

 

Are y'all in agreement, then, that if a $32B owner chooses to switch to $6E permanently he should buy a "matching" memcal and install his PROM's on that?

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'87 IROC 5.7l TPI - original owner!

 

I agree with one of Grumpy's earlier posts in another thread...."you should run a Memcal as close to your application as possible".

If you are disabling the 9th injector, you are effectively turning your pre-1989 MAF car into a 1989 MAF car. So logic would suggest that running a 1989 Memcal would be "safer" for the "worst case" scenerio.