Bad idle.
#3
Doubt it, i think its a fuel pressure issue, my pressure at idle is lower than normal, and I couldn't here the ticking, then the ticking started and idle got better and fuel pressure went up. But it's still not normal but better. It's a new pump I hope it's not bad
#6
Senior Member
iTrader: (6)
You need to log and look at desired fuel pressure, fuel pressure, map sensor, throttle position, timing advance, rpm, target idle rpm, MAF lb/min, VE lb/min. I think thats everything, then start comparing to what your tune calls for vs what you're seeing.
#9
No it's been this cool before and it didn't do it. If I drive the car a while and then stop and let it idle, it's ok for about 20 seconds then it starts going weird. Vacuum acts funny. From -21 to -18 back and forth. Maybe my tb is going? I'll log today and that should tell me
#11
Senior Member
iTrader: (6)
There are all kinds of things that will cause the LNF to idle funny. Incorrect DAL, MAF base table, EXH INT cam tables, Opt Spark, Opt torque. Needless to say it can be a little hairy to figure out
#12
I'll do oil change and spark plug change on weekend as well, spark plugs have been through some abuse so see if that helps. Did see misfire in cylinder 1 and 2 a little on gauge. Will double check it on hp tuners cause gauge isn't very reliable for misfire issues unless they is big
#13
Well today I do compression test and change plugs. Now my turbo sounds funny under boost. I'll be checking that as well. This is starting to get annoying. Guess I'll check for boost leaks again check my intake for leaks, probably check pcv system Saturday since idle issue seems to clear up when I take the oil cap off mostly. I don't know why my car can't just throw a cel ever when I have an issue so I know where to start lol.
#15
Junior Member
Anyways I picked up a oem tail pipe exhaust expander and heated the pipe with propane and went to town.
Hope this helps, Sorry I am no help since i am still learning about these cars myself, But keep us posted
#16
Senior Member
iTrader: (6)
I used that trick, minus heating it on my hot side charge pipe. Had a nasty boost leak due to the previous owner tightening the lower clamp to much. Rented an exhaust expander and boom perfect fit
#20
Well intake valves don't look to good. Even with Powell separator oil still getting in from pcv valve but mostly carbon buildup from combustion gases it seems. Intake manifold was pretty clean. Probably cause of meth. Gonna blast em again
#21
Well did lots of work today. Oil change, checked bpv, intake, few other hoses. Changed o2, cleaned rear o2, Walnut blasted valves, cleaned intake mani and tb. Idle is good now it seems, shall see on cold star tomorrow. Turbo still has a funny buzzing type noise at high boost but goes away after a little bit at full boost. Just don't get it. Should probably check for exhaust leaks maybe