boatrboy
Well-Known Member
Ok pl - I know you don’t like to read the entire thread before commenting so here it it-Idling 10 rpm too high? Tell me this is a typo. View attachment 147708
Something was wrong - I fixed it
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Ok pl - I know you don’t like to read the entire thread before commenting so here it it-Idling 10 rpm too high? Tell me this is a typo. View attachment 147708
Ok pl - I know you don’t like to read the entire thread before commenting so here it it-
Something was wrong - I fixed it
"room" i.e. parameter?Not only that, the fact the room was 10 rpm them 20 rpm and the fact iac was pegged to zero led you to the problem!
? Also see posts 32 and 37 - thoughts?
The MAP at idle is still a bit high it appears. It should be closer to 5.8 PSIA which is about 18 In Hg. Maybe someone else can comment on the idle vacuum for these engines. Assuming the new data is accurate then still there appears to be a bit of a vacuum leak somewhere or the throttle body needs adjusting. At least the IAC seems to be modulating at idle now. However, it is hard to say because the data at idle isn't the same as we looked at which was key on, engine not running, and fault list. The TPS at 0.12% is curious - you might want to visit setting up the throttle body then the TPS.? Also see posts 32 and 37 - thoughts?
The MAP at idle is still a bit high it appears. It should be closer to 5.8 PSIA which is about 18 In Hg. Maybe someone else can comment on the idle vacuum for these engines. Assuming the new data is accurate then still there appears to be a bit of a vacuum leak somewhere or the throttle body needs adjusting. At least the IAC seems to be modulating at idle now. However, it is hard to say because the data at idle isn't the same as we looked at which was key on, engine not running, and fault list. The TPS at 0.12% is curious - you might want to visit setting up the throttle body then the TPS.
Wow - Eric - did you write the 555 program? Did Tt help??I don't think that a vacuum leak would manifest itself as you suggest. The MAP sensor should be reading the air pressure and it doesn't care if the air coming in would be from the IAC motor, the parked throttle blade or a vacuum leak. To me the TPS not at zero is not unusual, still below were the "idle mode logic" would be set which kicks off the IAC and spark idle logit to try to control to target RPM.
The fact that MAP is higher on this run vs someone else (or a later run) could be explained by the idle spark. Idle is control by the dance of spark and the IAC motor, spark moving fast (cyl even to event) and the iac motor moving slower. Once the desired idle is achieved the system doesn't care is map is slightly higher... it just pulls back spark to remove extra tq.
Anyway, I'm just speculating at this point, it's hard to diagnose anything remotely, and with just single snapshots and not graphs, etc.
Wow - Eric - did you write the 555 program? Did Tt help??
I will try to capture a graph as I go though an rpm rise. All of my runs on the port motor show an idle of 650 and the map is pretty consistent in the 6.3 range. This is similar to the data supplied by tri in post 27.
I can’t wait to drive my boat and see what it runs like. It always runs good, just idled a little high until now. I purchased new plugs and wires, even though the plugs are only 1 yr old. and will install them to start my season. I’ve been out of commission with foot surgery so I haven’t taken boat out since launch….
And thanks for the information - I’m getting quite an education here.