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Engine Specific Tech
96-04 - 2V Specific
Rough start weird idle
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<blockquote data-quote="I_LIKE_TURTLEZ" data-source="post: 1579895" data-attributes="member: 31555"><p>When you say hard start I assume you mean it doesn't want to fire right away but the starter is spinning freely and able to illuminate a test light brightly.</p><p></p><p></p><p><strong>If your car thinks it's running rich</strong> then it likely is, there aren't many things that can cause that.</p><p></p><p>-Check the air filter and clean it out(yes seriously)</p><p>-Check the MAF data PID(you expect to see about 1g/s per liter)</p><p>-Hook up a fuel pressure gauge and run the car, then turn it off. If pressure rapidly decreases you have a stuck open injector. You could also use a stethoscope on each injector, one stuck open would make no mechanical clicking.</p><p>-Check upstream o2 data; they sometimes go lazy with age.</p><p></p><p></p><p><strong>If you meant the car thought it was lean</strong>, most often it's a vacuum leak. It's a 20+ year old car, I can assure you it has leaks, most are too small to make a noticeable difference until they get worse. </p><p>-All of the above applies. </p><p>-Check fuel pressure. </p><p>-Check for an exhaust leak, you may not hear it from inside the cabin. </p><p></p><p></p><p>You would expect to see a positive short term fuel trim on a cold start, followed by a slightly negative once warm; variance of +/- 10 is considered acceptable depending on RPM. </p><p>Since the car is stumbling from throttle input while trying to add fuel, personally I'd be going straight to the fuel pressure testing.</p></blockquote><p></p>
[QUOTE="I_LIKE_TURTLEZ, post: 1579895, member: 31555"] When you say hard start I assume you mean it doesn't want to fire right away but the starter is spinning freely and able to illuminate a test light brightly. [B]If your car thinks it's running rich[/B] then it likely is, there aren't many things that can cause that. -Check the air filter and clean it out(yes seriously) -Check the MAF data PID(you expect to see about 1g/s per liter) -Hook up a fuel pressure gauge and run the car, then turn it off. If pressure rapidly decreases you have a stuck open injector. You could also use a stethoscope on each injector, one stuck open would make no mechanical clicking. -Check upstream o2 data; they sometimes go lazy with age. [B]If you meant the car thought it was lean[/B], most often it's a vacuum leak. It's a 20+ year old car, I can assure you it has leaks, most are too small to make a noticeable difference until they get worse. -All of the above applies. -Check fuel pressure. -Check for an exhaust leak, you may not hear it from inside the cabin. You would expect to see a positive short term fuel trim on a cold start, followed by a slightly negative once warm; variance of +/- 10 is considered acceptable depending on RPM. Since the car is stumbling from throttle input while trying to add fuel, personally I'd be going straight to the fuel pressure testing. [/QUOTE]
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96-04 - 2V Specific
Rough start weird idle
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