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Technical Q&A. HOW TO's, TSB's & Warranty Items Have a Problem? Technical Questions & Answers. HOW TO's & TSB's, Warranty Issues

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Old 10-12-2020, 04:17 PM   #1
BlkStang4 me
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Help! P0308 multiple fixes attempted

Ok guys, what am I forgetting. I have the P0308 SES light and so far I have tried injector cleaner/lubricant additive, injector replacement, coil pack, and last but not least, the old spark plug. What other thoughts do you guys have to check? Should I be looking electrical to make sure Iím getting enough fuel? Do you think piston ring? HELP?
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RWHP 274.3 / RWTQ 300.2
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Old 10-12-2020, 04:53 PM   #2
DSG2003Mach1
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Re: Help! P0308 multiple fixes attempted

I would verify that connector to both the injector and coil pack are good - on my lightning one of the coil connectors broke so you could just slide it on and off. I'd go ahead and just trace out the visible wiring while you're at it for obvious rubs. Could be anything down to a bad coil or injector driver on the pcm even.

This is one of those things it might be worth ponying up to let a shop with the IDS computer hook up to it and see whats going on. They identified my misfire cause within a couple of minutes. $95 and a ziptie later I was on my way (i replaced the connectors myself when I got home). IDS can also identify low compression (relative to other cylinders, not an absolute number).
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Old 10-13-2020, 11:23 PM   #3
BlkStang4 me
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Re: Help! P0308 multiple fixes attempted

Sounds like a plan, Iíll look into finding a good shop in the Orange County CA area. Unless anyone has a suggestion??
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Ď04 DSG Mach 1 -
5-Speed
No mods...YET!

R.I.P. -
'03 Black Mach 1 -
Automatic
Performance Mods:
K & N Aircharger
Flowmaster Super 40's
Eibach Pro Springs
Diablo Sport CMR
RWHP 274.3 / RWTQ 300.2
Appearance Mods:
Too long to list
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Old 10-14-2020, 08:59 PM   #4
ASH302
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Re: Help! P0308 multiple fixes attempted

https://www.fixdapp.com/blog/p0308-c...gine%20failure.

Thought this could help.

ASh
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Old 10-14-2020, 09:03 PM   #5
ASH302
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Re: Help! P0308 multiple fixes attempted

http://www.mach1registry.org/forums/...d.php?t=124706

one more

ASh
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2001 lazer red v6 Mustang coupe sold in Aug 2006
2004 screaming yellow 5.0 sc Mach 1 sold in Oct 2012
2013 grey 6 speed coupe GT Mustang Sold in Feb 2014
2013 RED Dodge Charger R/T Sold Nov 2014
2002 custom Blue 02 Auto Trans AM Sold June 2015
1998 Cobra Black Sold summer 2016

Current
2009 Ford F350 FX4 March 2017 (work truck)
2003 OW 5.0 Mach 1 Aug 2020

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Old 10-15-2020, 10:16 AM   #6
hotford
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Re: Help! P0308 multiple fixes attempted

You try compression test and or leak down test?

You could have a seat that drop down?
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Old 10-20-2020, 07:49 AM   #7
ASH302
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Re: Help! P0308 multiple fixes attempted

Any updates on this problem OP was having?

ASh
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2001 lazer red v6 Mustang coupe sold in Aug 2006
2004 screaming yellow 5.0 sc Mach 1 sold in Oct 2012
2013 grey 6 speed coupe GT Mustang Sold in Feb 2014
2013 RED Dodge Charger R/T Sold Nov 2014
2002 custom Blue 02 Auto Trans AM Sold June 2015
1998 Cobra Black Sold summer 2016

Current
2009 Ford F350 FX4 March 2017 (work truck)
2003 OW 5.0 Mach 1 Aug 2020

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