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Cobra Forums
The Terminator
Engine/Tuning
2.9 whipple, loss of boost, lean
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<blockquote data-quote="MalcolmV8" data-source="post: 13569315" data-attributes="member: 8854"><p>Well since it was running great initially something has broken down. You mentioned three pumps and they're external which I imagine makes it easier to get to and test. Might start there. I know you have fuel pressure idling and revving it but that just tells you one pump is working. My car for example can go WOT in 1st and 2nd on just a single DS405 pump. It's midway through 3rd gear and up I need the second pump.</p><p>Maybe disconnect two pumps at a time and verify each pump is working.</p><p></p><p>Assuming all pumps are working get a pressure gauge hooked up and see what pressure you have when it goes lean.</p><p></p><p>Also check the basics like vacuum leaks. Any hoses popped off under hood etc. Use some carb spray and check all spots for possible leaks.</p><p></p><p>BTW be very careful with 17 AF at WOT. As soon as you stab the throttle and see it swinging lean let out immediately.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 13569315, member: 8854"] Well since it was running great initially something has broken down. You mentioned three pumps and they're external which I imagine makes it easier to get to and test. Might start there. I know you have fuel pressure idling and revving it but that just tells you one pump is working. My car for example can go WOT in 1st and 2nd on just a single DS405 pump. It's midway through 3rd gear and up I need the second pump. Maybe disconnect two pumps at a time and verify each pump is working. Assuming all pumps are working get a pressure gauge hooked up and see what pressure you have when it goes lean. Also check the basics like vacuum leaks. Any hoses popped off under hood etc. Use some carb spray and check all spots for possible leaks. BTW be very careful with 17 AF at WOT. As soon as you stab the throttle and see it swinging lean let out immediately. [/QUOTE]
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The Terminator
Engine/Tuning
2.9 whipple, loss of boost, lean
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