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2nd Generation
Ownership Update 2003 SVT Lightning #3380, small issues, fixes, and experiences
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<blockquote data-quote="Darren5.0L" data-source="post: 14646096" data-attributes="member: 31098"><p>Update on the ongoing issue.</p><p></p><p>Today I had a no-start condition, I had driven the truck in some wet weather yesterday without any issues and when I went to use the truck this morning, the engine cranked properly but did not fire.</p><p></p><p>I cycled the key a few times and could clearly hear the fuel pumps doing their thing, after a few more attempts the truck started and ran smoothly. After a few minutes it stalled sharply, like the key had been cycled off. It restarted fine and stalled again after a minute or two. At this point it would not start again. I checked the CPS connector by unplugging and re-plugging it in and manipulated the lower wiring harness, but it would not restart.</p><p></p><p>Finally after a few more starting attempts it ran and I held the idle at 2,000 rpm, it ran with a few 200 rpm drops at random intervals. It idled at normal speed for a few more minutes and stalled as before and would not restart.</p><p></p><p>I aggressively manipulated the wiring harness near the firewall between the bulk connectors and the PCM, and tried to restart, and it ran on the first try, smooth and steady.</p><p></p><p>I took it for a short test drive and observed no issues, running well and idling properly. I have since placed it in my heated shop and will explore the bulkhead wiring harness to PCM connector for issues.</p><p></p><p>Through out this entire bit, no DTC's were triggered.</p><p></p><p><em>Update:</em></p><p></p><p>After speaking with a trusted Ford tech on the matter we have agreed on a course of action that should either fix the problem or conclude where we need to address.</p><p></p><p>To isolate the OEM harness as the root cause I will be making a complete bypass harness and making my splice point near the PCM sensor output, Pins #21 & 22 (Dark Blue & Grey). This will test to see if I have an issue with the PCM itself, or with some portion of the factory harness.</p></blockquote><p></p>
[QUOTE="Darren5.0L, post: 14646096, member: 31098"] Update on the ongoing issue. Today I had a no-start condition, I had driven the truck in some wet weather yesterday without any issues and when I went to use the truck this morning, the engine cranked properly but did not fire. I cycled the key a few times and could clearly hear the fuel pumps doing their thing, after a few more attempts the truck started and ran smoothly. After a few minutes it stalled sharply, like the key had been cycled off. It restarted fine and stalled again after a minute or two. At this point it would not start again. I checked the CPS connector by unplugging and re-plugging it in and manipulated the lower wiring harness, but it would not restart. Finally after a few more starting attempts it ran and I held the idle at 2,000 rpm, it ran with a few 200 rpm drops at random intervals. It idled at normal speed for a few more minutes and stalled as before and would not restart. I aggressively manipulated the wiring harness near the firewall between the bulk connectors and the PCM, and tried to restart, and it ran on the first try, smooth and steady. I took it for a short test drive and observed no issues, running well and idling properly. I have since placed it in my heated shop and will explore the bulkhead wiring harness to PCM connector for issues. Through out this entire bit, no DTC's were triggered. [I]Update:[/I] After speaking with a trusted Ford tech on the matter we have agreed on a course of action that should either fix the problem or conclude where we need to address. To isolate the OEM harness as the root cause I will be making a complete bypass harness and making my splice point near the PCM sensor output, Pins #21 & 22 (Dark Blue & Grey). This will test to see if I have an issue with the PCM itself, or with some portion of the factory harness. [/QUOTE]
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Ownership Update 2003 SVT Lightning #3380, small issues, fixes, and experiences
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