dnxracer

iTrader: (1)

Hey guys so I have a 99 ek with a ob2b to obd1 jumper harness running to a obd1P75 and my car has recently had a 98 crv b20b4 engine into it ran fine a month ago when I received motor but now I've swapped it into my car and it's idling is horrible it idles fine while cold and warming up I've changed iacv twice with known working ones and no change checked for vacuum leaks nothing bought two ect sensors and put new plugs on ECT plug thinking maybe it was bad has new plugs and wires new intake gasket rebuilt stock injectors ls intake throttle body cable and fuel rail new thermostat bled cooling system three times on stands for 35 minutes until fan kicked on twice each time no change timing is dead on checked twice valves r within tolerances I'm so lost the car will idle good warming up but as soon as it is almost halfway on gauge the car will just completely die but will start right back up np but here's the kicker I'll turn it back then idles super low barely idling like 300rpm and I'll unplug ect and it'll idle up to 750 and stay around there and flu tuate a little like 825 to 750 then I can plug ect back in and it'll continue to idle that same way please help I'm out of thoughts and I'm ready to rip my hair out lol thank u so much guys!

dnxracer

iTrader: (1)

Oh and I checked compression all four cylinders are at 139 psi.

dnxracer

iTrader: (1)

Anyone??!

dnxracer

iTrader: (1)

Bump please

Jonzy

still having problems? I just finished my b20 swap and had a few problems

Jonzy

Has the tps been messed with at all? Perhaps the tps thinks its being given more throttle than it is so when the car warms up it is getting enough gas to run but once its warm and it closes some of the air and it cant stay running because it thinks it has more air than it does. Maybe the map sensor? The tps and the map swap right from a d16. I hope you figure it out man

dnxracer

iTrader: (1)

Me to man lol and yes I swapped tps and map and tps is calibrated to spec I have no idea lol

Jonzy

you checked for vacuum leaks with carb cleaner? Mine had the wrong throttle body gasket and caused a bad fluctuating idle

dnxracer

iTrader: (1)

yes I checked it with three cans three different times and have used three different throttle bodies and gaskets no change and just installed brand new 02 sensor no change

Jonzy

I guess its time to check your compression man maybe somethings up

dnxracer

iTrader: (1)

Already have 140 on all four give or take 1 or 2 psi and already adjusted valves

Jonzy

try adjusting the idle screw then? It should idle around 700 or so when fully warmed up. And you said theres no fluctuation huh?

dnxracer

iTrader: (1)

Theres fluctuation when warmed up only and usually it's just 750 to 150 then back up a couple times then dies when it does it the second time I have a video of what it's doin but I don't know how if show u lol

Jonzy

Hondas do this thing where if it thinks its idleing too high it cuts fuel at the injectors then it thinks its going to die so it lets the injectors do their thing then cycles like that. This normally happens from a vacuum leak somewhere. If you take the intake piping off and start it and put your hand over the throttle body to smother it does it die? It should and if it doesnt then it has a leak somewhere. But usually a vacuum leak causes high idle followed by low but you have normal idle followed by really low

dnxracer

iTrader: (1)

Yup done that it smothers it alright it kills the engine right now as soon as I do it

Jonzy

It must be some wiring issue or have you tried another ecu? Even the p2e?

dnxracer

iTrader: (1)

No I haven't all I have is a p75 and I'm afraid to buy another one and it not work and none of my friends have one to test it on

Jonzy

fuel pressure is good? Fuel pressure regulator is good?

dnxracer

iTrader: (1)

I assume but can't confirm cause I have to order the fitting they make to attach a gauge to it I don't have fuel in oil so I know diaphram isn't leaking but I unhooked cacuum from regulator to Max out pressure and no change and I also shot a shot of carb cleaner in the throttle body when it was getting ready to stall and it instantly killed it so I'm not sure if that helps or not lol

Jonzy

Carb cleaner would kill the motor. Does it rev up good when you put your foot on the gas? Does it bog and die? Does it go up and redline at like 4k?

dnxracer

iTrader: (1)

I can drive this car down the road with np until I stop then it stalls and dies it red lines at like 6k I had it at 90 with no probs at all drives great

Jonzy

im out of guesses... Anybody else?

dnxracer

iTrader: (1)

Thanks for the help I appreciate it man at least u tried

Jonzy

https://honda-tech.com/how-tos/a/honda-civic-why-is-my-idle-having-problems-377235 try that out

dnxracer

iTrader: (1)

Done everything on that page and nothing fixed it lol anyone else ideas ?