496 ho surging/rough idle
#11
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ok from the scan tool what is IAC PWM % at dead idle fully warmed engine - what is it when key on only non running engine but warmed up ??? and what is from a cold engine with key on and at start up ?
Whats your tps voltage ?
Whats your MAP readings
whats your fuel pressure(s) readings
Whats your tps voltage ?
Whats your MAP readings
whats your fuel pressure(s) readings
Last edited by Cwajer85; 06-10-2016 at 11:48 AM.
#12
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ok from the scan tool what is IAC PWM % at dead idle fully warmed engine - what is it when key on only non running engine but warmed up ??? and what is from a cold engine with key on and at start up ?
Whats your tps voltage ?
Whats your MAP readings
whats your fuel pressure(s) readings
Whats your tps voltage ?
Whats your MAP readings
whats your fuel pressure(s) readings
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#17
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I wish I could figure out who makes them for Merc anyways some of the auto cross overs do not do as well plus have different PWM % compared to what Merc uses. Some auto cross overs even after new install will have a slight rough idle.
The harder the IAC works the faster it fails and of course on some IAC failures it has knocked out the PCM. I probably see 1 per year on an average.
Merc IAC do not even come painted anymore they use to. Just saying.
The harder the IAC works the faster it fails and of course on some IAC failures it has knocked out the PCM. I probably see 1 per year on an average.
Merc IAC do not even come painted anymore they use to. Just saying.
#18
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I wish I could figure out who makes them for Merc anyways some of the auto cross overs do not do as well plus have different PWM % compared to what Merc uses. Some auto cross overs even after new install will have a slight rough idle.
The harder the IAC works the faster it fails and of course on some IAC failures it has knocked out the PCM. I probably see 1 per year on an average.
Merc IAC do not even come painted anymore they use to. Just saying.
The harder the IAC works the faster it fails and of course on some IAC failures it has knocked out the PCM. I probably see 1 per year on an average.
Merc IAC do not even come painted anymore they use to. Just saying.
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