Ford vs Chevy Build-up

HandOverFist · 05-19-2015, 10:32 AM

Thanks guys - I won't be going back to the track until all sensors are verified as working. As it stands now the only engine sensors I have installed are the O2's, MAF, BAP, ECT, ATC and TPS...the EGR was deleted and the PCV has been plugged.

Going to the shop shortly to retest the BAP...Brian filled me in last night I should have been probing the battery grd instead of the grd at the harness.

HandOverFist · 05-19-2015, 04:11 PM

Did some probing today and verified the MAF is working correctly. The BAP sensor problem still plagues me tho...the only sensor that is not functioning. The color code of the wiring in the engine compartment is slightly different from the schematic...it is correct at the ECM termination point however. I don't have a clue where the transition occurs.

Schematic - http://www.veryuseful.com/mustang/te...ng_Diagram.gif

VREF color at the sensor is Brown/White (shows Orange/White on the schematic). It has the correct voltage of 5.07v key on/engine off.

Signal return is Grey/Red (shown as Black/White on the schematic). It has .04v.

BP is Green/Black which is correct all the way and has 2.58v. When I try the Hz scale on the meter it does not move from zero. There is only one scale on this meter for Hz (20K)...wrong scale for this test?

I did a continuity test on the BP wire from the sensor to the ECM connector and it appears solid...I am baffled at this point and don't know what to do next.

There was a 3 bar MAP sensor that came with the PMS and a short jumper attached to the piggyback harness. When I plug the 3 bar in the screen instantly shows it functioning...I can move the reading by applying suction to the port. I don't know if this could be used in lieu of the barometer sensor for this car/computer. Open to any suggestions as I'm totally stumped on this one.

Btw, I did bypass the PMS and went straight to the ECM as a test as well...still no Hz reading, but the engine still fires and runs.

tommy d · 05-19-2015, 08:17 PM

Rich, this car seems to have taught you some kind of ''new'' language. I don't understand what it is your saying anymore! Bap-Map-Hertz and Diode. You didn't hit your head or something did you?

Tony Corley · 05-19-2015, 10:41 PM

Rich, here is a good test procedure for your BAP circuit and sensor.

http://sbftech.com/index.php?topic=19336.0

HandOverFist · 05-20-2015, 01:17 AM

Quote:

Originally Posted by Tony Corley

Rich, here is a good test procedure for your BAP circuit and sensor.

http://sbftech.com/index.php?topic=19336.0

Thanks Tony - I did all the tests except the sensor unplugged portion described in the article...will try that tm. The PMS has a diagnostic that stores fault codes, but it shows none.

hutt1 · 05-21-2015, 11:45 AM

did you look at the procedure to set the distributor at sbftech? if you set the distributor like a crank trigger it will run but not not perform well at all.. I know this sounds very simple to do but if it it installed wrong it will not run fast.. The injectors are fired off the wheel in the distributor . Just a thought after I sold a car that I had a TON of money in and it would not run very fast and I installed the distributor incorrectly.. haha

HandOverFist · 05-21-2015, 12:28 PM

Pretty sure the distributor is in correctly, but I'll eyeball it again.

Alternator due back today and I'm going to stop and pick up two new O2 sensors just for good measure. The recorder for the PMS should arrive tm...I will then be able to log/review runs to do some intelligent tuning.

If all goes as planned I will forgo the TNT Friday at Bowling Green for the SportsNationals and haul the Mustang back to Buffalo Valley Friday evening for some tuning. I'll just roll into BG Saturday morning with the Camaro.

05-19-2015, 10:32 AM	#1
HandOverFist VIP Member Join Date: Oct 2013 Location: Gulf Breeze, FL Posts: 1,651 Likes: 8 Liked 33 Times in 16 Posts	Re: Ford vs Chevy Build-up Thanks guys - I won't be going back to the track until all sensors are verified as working. As it stands now the only engine sensors I have installed are the O2's, MAF, BAP, ECT, ATC and TPS...the EGR was deleted and the PCV has been plugged. Going to the shop shortly to retest the BAP...Brian filled me in last night I should have been probing the battery grd instead of the grd at the harness. __________________ Rich Taylor I/SA - 321

05-19-2015, 04:11 PM	#2
HandOverFist VIP Member Join Date: Oct 2013 Location: Gulf Breeze, FL Posts: 1,651 Likes: 8 Liked 33 Times in 16 Posts	Re: Ford vs Chevy Build-up Did some probing today and verified the MAF is working correctly. The BAP sensor problem still plagues me tho...the only sensor that is not functioning. The color code of the wiring in the engine compartment is slightly different from the schematic...it is correct at the ECM termination point however. I don't have a clue where the transition occurs. Schematic - http://www.veryuseful.com/mustang/te...ng_Diagram.gif VREF color at the sensor is Brown/White (shows Orange/White on the schematic). It has the correct voltage of 5.07v key on/engine off. Signal return is Grey/Red (shown as Black/White on the schematic). It has .04v. BP is Green/Black which is correct all the way and has 2.58v. When I try the Hz scale on the meter it does not move from zero. There is only one scale on this meter for Hz (20K)...wrong scale for this test? I did a continuity test on the BP wire from the sensor to the ECM connector and it appears solid...I am baffled at this point and don't know what to do next. There was a 3 bar MAP sensor that came with the PMS and a short jumper attached to the piggyback harness. When I plug the 3 bar in the screen instantly shows it functioning...I can move the reading by applying suction to the port. I don't know if this could be used in lieu of the barometer sensor for this car/computer. Open to any suggestions as I'm totally stumped on this one. Btw, I did bypass the PMS and went straight to the ECM as a test as well...still no Hz reading, but the engine still fires and runs. __________________ Rich Taylor I/SA - 321 Last edited by HandOverFist; 05-19-2015 at 04:22 PM.

05-19-2015, 08:17 PM	#3
tommy d Senior Member Join Date: Oct 2010 Location: Indiana Posts: 830 Likes: 1,627 Liked 359 Times in 135 Posts	Re: Ford vs Chevy Build-up Rich, this car seems to have taught you some kind of ''new'' language. I don't understand what it is your saying anymore! Bap-Map-Hertz and Diode. You didn't hit your head or something did you? __________________ Who owns this car, with the peace sign,mag wheels, and four on the floor?

05-19-2015, 10:41 PM	#4
Tony Corley Member Join Date: Nov 2011 Posts: 264 Likes: 42 Liked 61 Times in 25 Posts	Re: Ford vs Chevy Build-up Rich, here is a good test procedure for your BAP circuit and sensor. http://sbftech.com/index.php?topic=19336.0

05-21-2015, 11:45 AM	#6
hutt1 Member Join Date: Jan 2008 Location: Portland, Tn Posts: 123 Likes: 0 Liked 1 Time in 1 Post	Re: Ford vs Chevy Build-up did you look at the procedure to set the distributor at sbftech? if you set the distributor like a crank trigger it will run but not not perform well at all.. I know this sounds very simple to do but if it it installed wrong it will not run fast.. The injectors are fired off the wheel in the distributor . Just a thought after I sold a car that I had a TON of money in and it would not run very fast and I installed the distributor incorrectly.. haha

05-21-2015, 12:28 PM	#7
HandOverFist VIP Member Join Date: Oct 2013 Location: Gulf Breeze, FL Posts: 1,651 Likes: 8 Liked 33 Times in 16 Posts	Re: Ford vs Chevy Build-up Pretty sure the distributor is in correctly, but I'll eyeball it again. Alternator due back today and I'm going to stop and pick up two new O2 sensors just for good measure. The recorder for the PMS should arrive tm...I will then be able to log/review runs to do some intelligent tuning. If all goes as planned I will forgo the TNT Friday at Bowling Green for the SportsNationals and haul the Mustang back to Buffalo Valley Friday evening for some tuning. I'll just roll into BG Saturday morning with the Camaro. __________________ Rich Taylor I/SA - 321