notsolfast

Alright, i have a turbo gsr swapped del sol, everything built and balanced properly, running perfect for over a year. Just recently i go to start up my car, starts right up, and after about 30 seconds or if i start driving all hell breaks loose.

The exhaust note changes like vtec has kicked on, the afr goes to 10.1 to 12.6, and the idle lopes like it has a crazy cam in it.

One it reaches operating temp, exhaust note changes, afr goes right back to normal and all is perfect. No problems.

-ect sensor replaced
-new main relay, my old one got moisture in it (fixed)

Any help would be appreciated

grumblemarc

iTrader: (4)

The first thing I'm going to ask you about is your MAP. You're using what for engine management?

notsolfast

Sorry, i should have put that on here, tuned on crome pro from a chipped and socketed p06 ecu

Former User

It's not abnormal for a cold engine to run rich.

CEL codes?

Last tune up?

notsolfast

Yeah but its at the point where it barely idles. And i do all filters and plugs every year, so i had just done them a month ago.

Muckman

iTrader: (2)

It sounds like a tuning issue. Who tuned this? Innovative?

notsolfast

Yeah innovative did, but it was tuned and ran for over a year with no problems

grumblemarc

iTrader: (4)

You might want to stop saying that.

notsolfast

Could it be possible that the iacv would be causing this? I know they screw with idle, but do they adjust fuel as well?

grumblemarc

iTrader: (4)

How are you jumping to the IACV?

Muckman

iTrader: (2)

Why don't you touch base with the tuner to make sure the tune isn't responsible. It could be O2 feedback gone haywire. Maybe the O2 sensor has gone bad.

notsolfast

I jumped to the iacv because i know they cause idle loping problems. And its obd1, i only have a wideband o2 for monitoring. Ill see if i can call and see if he needs to re do the startup fuel maps or if that could be the culprit

Fliptard

I would check with the tuner . Most tuning shops will either re-tune or maybe check it out for a discounted price, because you had it tuned there and came back with the same car/setup.

notsolfast

Alright, made an appointment with my tuner, im the meantime i decided to do some tests. Tried to get more air out of my coolant, tested the throttle position sensor which was fine. And i checked the map sensor (2.5 bar motorola) i checked the voltage between the green/white and red/yellow wire and got 5 volts which is normal, however when i tested the green/white to the solid white wire, i only got 1.37 volts. Not sure if that means its shot or if it has a lower voltage because its an aftermarket one. Anyone familiar with those sensors?

wantboost

iTrader: (2)

Map sensor output voltage directly relates to manifold pressure. since higher pressure sensors read more pressure for the same 0-5v scale as OEM that means at idle output voltage will be lower.

notsolfast

Damn, there goes that idea. Is it really possible for a tune to lose its cold start map just like that?

notsolfast

Problem solved guys. If anyone has the same problem and has hit a wall, take off your vtec solenoid and check the gasket. Mine was new but it was a little stretched, im assuming just enough so oil would bypass the solenoid completely. And when the engine heats up, it expands and seals it tight. My only guess as to what it was.

grumblemarc

iTrader: (4)

How does a VTEC solenoid cause a car to run rich? Asking because in the years I've owned these cars I've never had this issue.

wantboost

iTrader: (2)

If enough oil was being bypassed to lock the rockers and engage vtec then technically it should have been running lean.

notsolfast

Wouldnt it adjust the iacv due to the idle loping so much to add more fuel? I guess i didnt think about that. It should have ran lean. I just cleaned up the gasket and slapped some hondabond on it and it was good to go

grumblemarc

iTrader: (4)

What does the VTEC solenoid have to do with the IACV?

notsolfast

Theyre indirectly related because the larger cam lobes would change the idle, and the iacv would have to adjust right?

grumblemarc

iTrader: (4)

I'm not quizzing you. You asking me or telling me?
What larger cam? You know you have two of them?

notsolfast

I was unsure, i figured you knew. How else would it have solved my issue?

grumblemarc

iTrader: (4)

Well, I have a problem with your fix because I have yet to see someone solve an IACV issue by working on the VTEC solenoid. I think it was absolute coincidence.