hey guys,
newbie here.bought my bucket list car a few months ago.34 ford with 1986 camero,or firebird 305 tuned port.my problem is that when I first start it,it idles ruff and wants to stall.can smell raw gas also.after about 5 minutes she smooths out and runs fine.it has a cold start injector,but no wire connected to it.the ecm is for speed density[16198262],and the engine has maf.[1227165].this looks like a very professional build .no expense sparred,but I cant understand why they used the s.d computer.any help will be much appreciated.

 

As long as they added a MAP sensor it will work. Why they did it this way, who knows. Could be that the MAF is bad and they were having trouble finding a good one at a reasonable price.

RBob.

 

7165 is for MAF. 7130 is for S.D. If they aren't running the MAF, Do they have a MAP Sensor on the car? Generally another reason people run the SD computer is so they can eliminate the Knock module. If done correctly, they will remove this module all togethor as the EEPROM which I believe is AUJP or equivelant handles the knock counts. But the knock sensor is different for a 305 and 350 if the SD sensor is used if you eliminate the knock sensor. If they are now using the MAF, have they left the 2 module (Power and Burnoff) on the firewall? I at this point probably have just as many questions as you.. LOL

 

Sounds like alot more trouble then spending the $$$ for the maf unless they assumed the ECM was bad also.. Would the car have to be repinned or will that ecm work?? Doesn't sound too professional IMO

 

hello.it is running maf,and there is no knock sensor.i bought one but havnt installed it as the car is in storage till spring.it is pinging and I thought it is because of not having a knock sensor.i am getting so frustrated with it I am thinking of going back to a 4 barrel,but once warmed up it runs fine except for the pinging.i really appreciate any help.thank you

 

WOW!!! This isn't a very professional install from what I think.. RBob might have more insightful information and is pretty knowledgable in this area also.. The Knock sensor should be located just above the oil pain and can found on either the right or left side of the block. I relocated mine as the Supercharger lines were in the way. The Knock sensor's sole purpose is to find knock and pull timing using the computer. Are you missing the ESC module located on the firewall and the knock sensor on the base of the engine by the oil pan??

 

Easiest way to sort this out is this: Pull out your ecm and take the chip out. Now ,try and get some numbers or letters off of it and post that here. Your cold start injector is disconnected and that ok. If your ecm is speed density,then you should be using a 1990-92 speed density chip. Find out for sure. I would unplug the MAF and drive it. Also, check on your plenum for a vacuum hose that goes to a MAP sensor. I suspect that is what you are using anyway.

 

If he is running speed density, then he doesn't need an ESC sensor. Just a 1990 and up knock sensor for a 350

 

He can't be running both MAF and speed density at the same time!

 

take that MAF sensor off of that thing and throw it away! stick with speed density

 

That is what I am trying to figure out. Doesn't sound like whoever did the conversion did a very good job.

Depending on who did the conversion. On that year, you can run only MAF or MAP, not both. But, pending on the ECM used, will also determine which knock sensor is used. The signal's are different. The 7730 used internal logic and the 165 used the E.S.T. as you already know. I was trying to determine if they bypassed the E.S.T. Module, and just left it on the firewall or if they removed it.

Maf is forgiving when doing minor engine mods and doesn't require alot of tuning. If going wild mods, I would say go S/D. But S/D is still pretty good for both.

 

You need to start by sorting out the hardware before going any farther.

The ECM is a 1227730 equivalent, so it will use speed density parts, to function correctly.

The only reason I can see using a MAF is as an IAT sensor, but I'm not sure that the F-body system had that built into the MAF.

Once you have the system up and running correctly, you will enjoy it more than if you swap to a carb.

Without knowing exactly what hardware is installed on the car, and I mean more than just ECM service numbers, but pictures and carnal knowledge of the vehicle in question, it will be very difficult to sort the system out. It may be best to see if you can find someone local that really does know what they are doing with the Delco EFI systems, to go through it.

 

why don't you post up some pictures. Take some pictures of the connections on the plenum. The vacuum hoses, fuel injection sensors. A MAP sensor should be getting its vacuum from your plenum. Look on the passenger side of the plenum. You should have one small vacuum hose from plenum to fuel pressure regulator ,another larger hose from plenum to MAP sensor and another small hose that goes to a check valve and or acts as a vacuum source for your heater.

 

Unplug the MAF sensor and see if it runs any different. I suspect someone just left it there to avoid buying another intake assembly.

 

THANKS GUYS REALLY APPRECIATE YOUR INPUT.WILL POST PICTURES,.MAYBE YOU CAN SEE SOMETHING FROM THEM.