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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
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<blockquote data-quote="Bullitt5566" data-source="post: 15732753" data-attributes="member: 119066"><p>I've had the same problem for well over two years. I have Comp Cams XE270 w/10 degrees overlap. I've replaced just about everything and tried everything in the tune. I found that if I set the throttle stop by setting the base idle using the disconnect IAC/TP and set by the lowest stable idle method. The base idle is 850 and the lowest idle with IAC is around 900. This method screws up the dashpot settings and getting from driving to idle the car will hang and die. The same problem you described, hangs at 1000-1200 and drops to idle uncontrolled. In fact if you watch the dashpot, the idle will hang until the dashpot completely decays then drops uncontrolled. However if I set the throttle stop to stock (all the way closed) the idle is completely dependent on IAC, but the dashport settings and return to idle is much better, no hanging. But, the idle will drop too low and the engine will stall at times. Even if I set the idle at 900 rpm.</p><p></p><p>I keep thinking the problem is entirely the tune, cams, draw through MAF, returnless fuel system, but then I see cars with my exact setup and they don't have the idle problems I do. If it was tune related, I'd think even an amateur would be able to stumble across the correct settings after so much time.</p><p></p><p>So I'm back to a mechanical issue or the cams. I'm getting ready to pull the comp cams and put the stock back in, that seems to fix the issue or more correctly mask the issue, because they have a much larger margin for error.</p><p></p><p>Other ideas are crankshaft or camshaft sensors only because I've checked, replaced, or set everything else. In the tune the RPM seems to jump around. Maybe this is normal.</p><p></p><p>I think you'll find that the hanging idle when coming to a stop can be tuned using the minimum dashport when in low gears. If you lower this at the lowest setting the engine will be allowed to idle down lower when coming to a stop. I've seen some places say to set this to 0. This will absolutely cause the engine to die when coming to a stop.</p><p></p><p>Let me know what you find. I'd really like to get this problem fixed.</p></blockquote><p></p>
[QUOTE="Bullitt5566, post: 15732753, member: 119066"] I've had the same problem for well over two years. I have Comp Cams XE270 w/10 degrees overlap. I've replaced just about everything and tried everything in the tune. I found that if I set the throttle stop by setting the base idle using the disconnect IAC/TP and set by the lowest stable idle method. The base idle is 850 and the lowest idle with IAC is around 900. This method screws up the dashpot settings and getting from driving to idle the car will hang and die. The same problem you described, hangs at 1000-1200 and drops to idle uncontrolled. In fact if you watch the dashpot, the idle will hang until the dashpot completely decays then drops uncontrolled. However if I set the throttle stop to stock (all the way closed) the idle is completely dependent on IAC, but the dashport settings and return to idle is much better, no hanging. But, the idle will drop too low and the engine will stall at times. Even if I set the idle at 900 rpm. I keep thinking the problem is entirely the tune, cams, draw through MAF, returnless fuel system, but then I see cars with my exact setup and they don't have the idle problems I do. If it was tune related, I'd think even an amateur would be able to stumble across the correct settings after so much time. So I'm back to a mechanical issue or the cams. I'm getting ready to pull the comp cams and put the stock back in, that seems to fix the issue or more correctly mask the issue, because they have a much larger margin for error. Other ideas are crankshaft or camshaft sensors only because I've checked, replaced, or set everything else. In the tune the RPM seems to jump around. Maybe this is normal. I think you'll find that the hanging idle when coming to a stop can be tuned using the minimum dashport when in low gears. If you lower this at the lowest setting the engine will be allowed to idle down lower when coming to a stop. I've seen some places say to set this to 0. This will absolutely cause the engine to die when coming to a stop. Let me know what you find. I'd really like to get this problem fixed. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
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