2007 Shelby GT
06-30-2012, 05:22 PM
#11
Join Date: Jun 2012
Location: PA.
Posts: 4
With this pronounced an issue, I would assume it's throwing a CEL (check engine light). You can rent a code reader from autozone, and the net cost be 0 if you get it back to them that day. My advice would be to get the code(s) first. Likely point you to the issue(s). Or at the very least let someone else narrow it down for you.
Diagnosing a COP issue, and related is pinpoint test JC in the powertrain control and emissions diagnosis section (a separate released service manual set), but the online links don't exist for higher than "H". I've not looked much elsewhere, perhaps if you look for another set of those online manuals referenced somewhere else you could find it.
The wiring diagram is here:
http://iihs.net/fsm/?dir=40&viewfile...20-%204.6L.pdf
It's all PCM controlled, since the one side is working fine, I'd suspect a break along the red wires near the Ignition transformer capacitor running that side, or the capacitor itself (page 1 of the link above), they're inter-connected (PCM giving ground for firing), but that may be enough to cause insufficient spark for that side. If you can smell gas from the exhaust (as its not being burned), then it's likely something related. http://iihs.net/fsm/?dir=7&viewfile=...%20Systems.pdf
Or if you smell no gas, it may be getting spark on that side and no fuel. In which case, page 2 of the above link. Red wires again, but isolated from one side to the other(splits off to the 2 sides from the BEC's fuel pump relay). Checking voltage readings from one side to the other for the injectors will likely tell the tale. http://iihs.net/fsm/?dir=195&viewfil...ded%20View.pdf
I'm good with electronics, just don't mistake me for someone who knows much about engines.
Diagnosing a COP issue, and related is pinpoint test JC in the powertrain control and emissions diagnosis section (a separate released service manual set), but the online links don't exist for higher than "H". I've not looked much elsewhere, perhaps if you look for another set of those online manuals referenced somewhere else you could find it.
The wiring diagram is here:
http://iihs.net/fsm/?dir=40&viewfile...20-%204.6L.pdf
It's all PCM controlled, since the one side is working fine, I'd suspect a break along the red wires near the Ignition transformer capacitor running that side, or the capacitor itself (page 1 of the link above), they're inter-connected (PCM giving ground for firing), but that may be enough to cause insufficient spark for that side. If you can smell gas from the exhaust (as its not being burned), then it's likely something related. http://iihs.net/fsm/?dir=7&viewfile=...%20Systems.pdf
Or if you smell no gas, it may be getting spark on that side and no fuel. In which case, page 2 of the above link. Red wires again, but isolated from one side to the other(splits off to the 2 sides from the BEC's fuel pump relay). Checking voltage readings from one side to the other for the injectors will likely tell the tale. http://iihs.net/fsm/?dir=195&viewfil...ded%20View.pdf
I'm good with electronics, just don't mistake me for someone who knows much about engines.
06-30-2012, 05:24 PM
#12
Join Date: Jun 2012
Location: PA.
Posts: 4
With this pronounced an issue, I would assume it's throwing a CEL (check engine light). You can rent a code reader from autozone, and the net cost be 0 if you get it back to them that day. My advice would be to get the code(s) first. Likely point you to the issue(s). Or at the very least let someone else narrow it down for you.
Diagnosing a COP issue, and related is pinpoint test JC in the powertrain control and emissions diagnosis section (a separate released service manual set), but the online links don't exist for higher than "H". I've not looked much elsewhere, perhaps if you look for another set of those online manuals referenced somewhere else you could find it.
The wiring diagram is here:
http://iihs.net/fsm/?dir=40&viewfile...20-%204.6L.pdf
It's all PCM controlled, since the one side is working fine, I'd suspect a break along the red wires near the Ignition transformer capacitor running that side, or the capacitor itself (page 1 of the link above), they're inter-connected (PCM giving ground for firing), but that may be enough to cause insufficient spark for that side. If you can smell gas from the exhaust (as its not being burned), then it's likely something related. http://iihs.net/fsm/?dir=7&viewfile=...%20Systems.pdf
Or if you smell no gas, it may be getting spark on that side and no fuel. In which case, page 2 of the above link. Red wires again, but isolated from one side to the other(splits off to the 2 sides from the BEC's fuel pump relay). Checking voltage readings from one side to the other for the injectors will likely tell the tale. http://iihs.net/fsm/?dir=195&viewfil...ded%20View.pdf
I'm good with electronics, just don't mistake me for someone who knows much about engines.
Diagnosing a COP issue, and related is pinpoint test JC in the powertrain control and emissions diagnosis section (a separate released service manual set), but the online links don't exist for higher than "H". I've not looked much elsewhere, perhaps if you look for another set of those online manuals referenced somewhere else you could find it.
The wiring diagram is here:
http://iihs.net/fsm/?dir=40&viewfile...20-%204.6L.pdf
It's all PCM controlled, since the one side is working fine, I'd suspect a break along the red wires near the Ignition transformer capacitor running that side, or the capacitor itself (page 1 of the link above), they're inter-connected (PCM giving ground for firing), but that may be enough to cause insufficient spark for that side. If you can smell gas from the exhaust (as its not being burned), then it's likely something related. http://iihs.net/fsm/?dir=7&viewfile=...%20Systems.pdf
Or if you smell no gas, it may be getting spark on that side and no fuel. In which case, page 2 of the above link. Red wires again, but isolated from one side to the other(splits off to the 2 sides from the BEC's fuel pump relay). Checking voltage readings from one side to the other for the injectors will likely tell the tale. http://iihs.net/fsm/?dir=195&viewfil...ded%20View.pdf
I'm good with electronics, just don't mistake me for someone who knows much about engines.
07-01-2012, 12:16 PM
#14
4th Gear Member
Join Date: Dec 2010
Location: Gallifrey
Posts: 1,596
So you can smell gas from the exhaust?
http://iihs.net/fsm/?dir=40&viewfile...on%20Views.pdf (page 4 and 6)
I am unsure as to which line(s) the PCM internally uses to ground those coils, so you may wish to clean up the 2 grounds the PCM uses first. It may simply not be getting a good ground on one of the 2 it uses.
See page 2 of the above link, PCM uses G102 and G103.
http://iihs.net/fsm/?dir=40&viewfile...on%20Views.pdf (page 4 and 6)
I am unsure as to which line(s) the PCM internally uses to ground those coils, so you may wish to clean up the 2 grounds the PCM uses first. It may simply not be getting a good ground on one of the 2 it uses.
See page 2 of the above link, PCM uses G102 and G103.
Last edited by wayne613; 07-01-2012 at 12:22 PM.
07-03-2012, 07:47 PM
#15
Thread Starter
Join Date: Jun 2012
Location: Florida
Posts: 6
Okay, here we go again. Seems like it rains and pours
As started with this problem, I replaced the battery in the car now about two weeks ago. Last week I had a problem with the door disarm switch of which Ford has the part ordered. Now this morning when I went to start the car, it ran for about 5 seconds, sputtered and quit. On the dash lights, the electronic throttle control "wrench" is lit. Tried to start it again, it did the same thing. My son has a tuning computer, set it up on the car and the only error coming up was the mass air sensor. It continued to do the same thing.
We disconnected the tps off the throttle body, let it sit about 5 minutes, hooked them back up and it started to run better. I still have the "wrench" is still lit, now I also have the check engine lite. I am scared to drive it too far in case it shuts off again. Should I be looking at the tps and mass air before I ever consider the throttle body?
Thank you
As started with this problem, I replaced the battery in the car now about two weeks ago. Last week I had a problem with the door disarm switch of which Ford has the part ordered. Now this morning when I went to start the car, it ran for about 5 seconds, sputtered and quit. On the dash lights, the electronic throttle control "wrench" is lit. Tried to start it again, it did the same thing. My son has a tuning computer, set it up on the car and the only error coming up was the mass air sensor. It continued to do the same thing.
We disconnected the tps off the throttle body, let it sit about 5 minutes, hooked them back up and it started to run better. I still have the "wrench" is still lit, now I also have the check engine lite. I am scared to drive it too far in case it shuts off again. Should I be looking at the tps and mass air before I ever consider the throttle body?
Thank you
07-03-2012, 08:50 PM
#16
4th Gear Member
Join Date: Dec 2010
Location: Gallifrey
Posts: 1,596
Check the related fuses first in the BEC. Marked "engine" in your owners manual. 3 total. After that:
http://iihs.net/fsm/?dir=10&viewfile=Diagnostic%20Trouble%20Code%20(DT C)%20Charts%20and%20Descriptions.pdf
http://iihs.net/fsm/?dir=11
http://iihs.net/fsm/?dir=10&viewfile=Diagnostic%20Trouble%20Code%20(DT C)%20Charts%20and%20Descriptions.pdf
http://iihs.net/fsm/?dir=11
Last edited by wayne613; 07-03-2012 at 08:52 PM.
07-13-2012, 04:48 PM
#17
Thread Starter
Join Date: Jun 2012
Location: Florida
Posts: 6
So, checking everything, the fuses were fine. My son has a performance tuning computer, and found a maf sensor not working right. Finally after finding one, it seems to have solved he problem. The part is finally in for the door disarm switch, so hopefully when that gets replaced, I will be totally over the moon with my car again.
Thanks for your help. I am learning quite a bit and so are my sons. Thanks again.
Thanks for your help. I am learning quite a bit and so are my sons. Thanks again.
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