DFI and ECMDiscuss all aspects of DFI (Digital Fuel Injection), ECMs (Electronic Control Module), scanners, and diagnostic equipment. Fine tune your Third Gen computer system for top performance.
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HOLLY CRAPPP, i didnt know they were THAT much. wow. lol. and the info came from alldata. the technical service bulletins.
And much was it to get that info? I've tried once to use it and it asked me to log in, sign up, and it seems to me that you may need a credit card aswell. Do you need to pay before you can get the info needed?
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And much was it to get that info? I've tried once to use it and it asked me to log in, sign up, and it seems to me that you may need a credit card aswell. Do you need to pay before you can get the info needed?
unfortunatly yes. the shop i work at has it, and so does my school. so i have access to it from both places. and idk how expensive it is, iv never really looked into it for my personal use (because i already have access). but i doubt its cheap. i can ask my boss or teachers what they pay.
theres got to be a wire gounding when it shouldnt be mine was doing the same thing not wanting to rev up above 2000 rpm when i have the gas all the way down. i found a few wires that the PO had spliced into but still havent found the problem but i did notice that 2 of my spark plug wires were cracked and taped them for a temp fix. i dont think its ur maf sensor cause they shouldnt be going out that fast. i dont know if u have already done this but if u have a voltage tester i would check the voltage of each wire going to the sensor with the ignition on.
much thx for responding.
the warrenty took care of the cost of the 2nd and 3rd maf. no the car did not run good for a bit. it ran like crap as soon as i connected the connector to the maf.
Scotty
hey thx for responding.
I did a voltage check with the ignition on (car not running). However i got no voltage. I did however got voltage when i started the car(car running). i got the 5 volts that is required. it sounds strange that this condition would occur. I also replaced the power relay for the maf sensor and the problem still presists.
Thx scotty
hey also when my car starts to overheat the engine acts up then dies and wont start untill the engine has cooled down enough to resatart the car. any ideas. there are no codes for this condition.
Yes your right. i did a test using a sunpro tester for MAF and others sensors and the manual says that i have to have voltage when the ignition is on but the engine is not running. However when i start the car and the engine is running, i get the right voltage. So that tells me the power wire is working but why am i not getting voltage when the car is on but i get voltage with the car engine running.
Much thx for hanging in there and helping me.
Scotty
hey thx for responding.
I did a voltage check with the ignition on (car not running). However i got no voltage. I did however got voltage when i started the car(car running). i got the 5 volts that is required. it sounds strange that this condition would occur. I also replaced the power relay for the maf sensor and the problem still presists.
Thx scotty
Quote:
I have a 1988 trans am with a 305.
Power to the MAF is +12 volts. That is pin E of the sensor. The MAF only receives power when the fuel pump is running and during burn off. So key-on, engine-off the MAF is powered up for 2 seconds. Then the ECM drops the fuel pump relay and the MAF power relay is also turned off.
When cranking and running the fuel pump is activated and the MAF is powered up. At key-off the ECM commands a burn off cycle and the MAF is powered up during this time.
Much thx for the info. Why is it that the car runs like crap with the sensor connected but runs fine with the sensor disconnected? this is frustrating to me. again much thx for ur help.
Scotty
Quote:
Originally Posted by RBob
Power to the MAF is +12 volts. That is pin E of the sensor. The MAF only receives power when the fuel pump is running and during burn off. So key-on, engine-off the MAF is powered up for 2 seconds. Then the ECM drops the fuel pump relay and the MAF power relay is also turned off.
When cranking and running the fuel pump is activated and the MAF is powered up. At key-off the ECM commands a burn off cycle and the MAF is powered up during this time.
Well I just wanted to say thanks to everyone here. And in fact I did learn that the 85 camaros do not have independent interchangable relays on the ecu! I just bought a new sensor and it worked
Much thx for the info. Why is it that the car runs like crap with the sensor connected but runs fine with the sensor disconnected? this is frustrating to me. again much thx for ur help.
Scotty
With the sensor connected the ECM uses it for the engine airflow. With the sensor disconnected the ECM knows this, so creates an airflow value based on the engine RPM and throttle position.
What this means is that the signal from the MAF is incorrect. Because when the ECM is using it the engine runs improperly. It may be the power to the MAF that is a problem. Or in the wires back to the ECM or the sensor or ECM itself is bad.
Try tapping on the MAF with the engine running, then do the same to the ECM. If how the engine is running changes then most likely you have found the culprit.
Well I just wanted to say thanks to everyone here. And in fact I did learn that the 85 camaros do not have independent interchangable relays on the ecu! I just bought a new sensor and it worked
It's a shame that the burn off module doesn't have plug-able relays. My understanding is that the burn off module is also on the expensive side.
Thx much for the info. However i have done verything (so i thought) i could. However i will check the wires going back from the MAF and get back to u as to what i find. Again thx.
Scotty
Hey i have another problem. When my car heats up it starts running rough and finally dies. I changed the thermostat and eveything in the cooling system checks ok. It wont start untill the engine has cooled down enogh to get the car started. this takes about 20 minutes. thx for ur help.
Scotty
