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SN95 Cobras
Chasing a misfire or stumble
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<blockquote data-quote="chao5.0" data-source="post: 15567259" data-attributes="member: 134651"><p>I had a set of Ford Racing wires on the car, the #8 was arcing in the hole of the cam cover so I swapped them all with new factory replacement Ford wires and plugs. The compression test revealed the engine is in good health cranking wise. Highest cylinder was 163 the lowest was 153, only 2 cylinders were below 160. Changed the fuel pump today and the car is about 85% better than what it was, I can actually drive it and apply some throttle to it, its still hesitant under heavy load. Talking with a few tuners today I classified the problem wrong, it isn't a misfire. The proper way to think of it is like its dropping cylinders from lack of fuel or a lean misfire. The ECU can compensate mostly for the problem but not fully, I was told if the fuel pump swap doesn't fix the issues then to change the injectors because they don't seem to up to the task anymore, especially when things get hot under the hood. I rechecked fuel pressure and before the pump swap I could only manage 32 at idle or during priming when Ford originally calls for 35-45 psi according to the original Ford manual for this car. Now it has proper fuel pressure things have gotten better which leaves 3 things left to cause this issue. 1. Injectors either weak or clogged 2. Fuel pressure regulator (highly doubtful) 3. Alternator going bad. Whenever I figure out what is wrong I will update even if changing injectors don't fix the issue, this way it will help someone out later on if they have the same issue.</p></blockquote><p></p>
[QUOTE="chao5.0, post: 15567259, member: 134651"] I had a set of Ford Racing wires on the car, the #8 was arcing in the hole of the cam cover so I swapped them all with new factory replacement Ford wires and plugs. The compression test revealed the engine is in good health cranking wise. Highest cylinder was 163 the lowest was 153, only 2 cylinders were below 160. Changed the fuel pump today and the car is about 85% better than what it was, I can actually drive it and apply some throttle to it, its still hesitant under heavy load. Talking with a few tuners today I classified the problem wrong, it isn't a misfire. The proper way to think of it is like its dropping cylinders from lack of fuel or a lean misfire. The ECU can compensate mostly for the problem but not fully, I was told if the fuel pump swap doesn't fix the issues then to change the injectors because they don't seem to up to the task anymore, especially when things get hot under the hood. I rechecked fuel pressure and before the pump swap I could only manage 32 at idle or during priming when Ford originally calls for 35-45 psi according to the original Ford manual for this car. Now it has proper fuel pressure things have gotten better which leaves 3 things left to cause this issue. 1. Injectors either weak or clogged 2. Fuel pressure regulator (highly doubtful) 3. Alternator going bad. Whenever I figure out what is wrong I will update even if changing injectors don't fix the issue, this way it will help someone out later on if they have the same issue. [/QUOTE]
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Chasing a misfire or stumble
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