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SN95 Cobras
Breaks up and misses under load-FPR?
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<blockquote data-quote="monkeyspunk79" data-source="post: 10080321" data-attributes="member: 4407"><p>Hello folks, once again I have an annoying problem I'm trying to track down with minimal time & tools at my disposal. But here goes. Feel free to chime in if anyone has any advice...</p><p></p><p>My 98 Cobra has developed a problem where it breaks up, bucks, and pops & misses under load or WOT. It only happens past about 3K rpm, and sometimes will happen higher or lower in the powerband depending on temperature or what gear I'm in. Lower gears are worse. <em>This is only when the car has warmed up as it runs 100% fine when its cold or after the first 5 minutes of driving.</em> I have done the following to try to improve this with no luck:</p><p></p><p>1. Checked IMRC cables. They both move when engine reaches 3250 rpm as they should. How far they're moving I can't tell, but it feels like they're doing their job</p><p></p><p>2. Replaced plugs & wires with OEM parts.</p><p></p><p>3. Swapped aftermarket coil packs back to OEM ones. </p><p></p><p>4. Changed fuel filter, cleaned MAF. </p><p></p><p></p><p>Another clue that may help...it takes a while to fire first thing in the morning. Like I have to cycle the key to build fuel pressure twice before I get it to fire up, otherwise I have to crank and crank until it finally sputters to life. The rest of the day its fine until it sits overnight. </p><p></p><p>What's my next step? Should I put a fuel pressure guage on it and see what she does? Could this be the fuel pressure regulator? How would I check this? Also if I do check fuel pressure, how can I do it to see what happens under load. All the kits I've seen have really short hoses that hook to the fuel rail, but I want to drive it and check fuel pressure under load...not just at idle. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p></p><p>Thanks as always, this place is THE site for SVT advice.:beer:</p></blockquote><p></p>
[QUOTE="monkeyspunk79, post: 10080321, member: 4407"] Hello folks, once again I have an annoying problem I'm trying to track down with minimal time & tools at my disposal. But here goes. Feel free to chime in if anyone has any advice... My 98 Cobra has developed a problem where it breaks up, bucks, and pops & misses under load or WOT. It only happens past about 3K rpm, and sometimes will happen higher or lower in the powerband depending on temperature or what gear I'm in. Lower gears are worse. [I]This is only when the car has warmed up as it runs 100% fine when its cold or after the first 5 minutes of driving.[/I] I have done the following to try to improve this with no luck: 1. Checked IMRC cables. They both move when engine reaches 3250 rpm as they should. How far they're moving I can't tell, but it feels like they're doing their job 2. Replaced plugs & wires with OEM parts. 3. Swapped aftermarket coil packs back to OEM ones. 4. Changed fuel filter, cleaned MAF. Another clue that may help...it takes a while to fire first thing in the morning. Like I have to cycle the key to build fuel pressure twice before I get it to fire up, otherwise I have to crank and crank until it finally sputters to life. The rest of the day its fine until it sits overnight. What's my next step? Should I put a fuel pressure guage on it and see what she does? Could this be the fuel pressure regulator? How would I check this? Also if I do check fuel pressure, how can I do it to see what happens under load. All the kits I've seen have really short hoses that hook to the fuel rail, but I want to drive it and check fuel pressure under load...not just at idle. :( Thanks as always, this place is THE site for SVT advice.:beer: [/QUOTE]
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Breaks up and misses under load-FPR?
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