M42 1991 318i- Starts then stalls, Mess under intake already completed, Purge Valve?

[ARsandBustedCars]

Yesterday at a stop sign, while at idle, I noticed my check engine light came on. Once I hit the gas the light turned off. Then while under a little bit of load, the car would bog out and buck and return back to normal rpm.

I then topped the tank off at a gas station. As I pulled onto my street and started to go uphill it bogged out and died. It would fire back up to normal idle, once I hit the gas it would bog out and die. It did this about 10 times. I took the fuel cap off and it started up and ran fine.

Now its sitting in my garage and there is a strong smell of fuel.

A few weeks ago I did the "mess under the intake". All hoses are new and hooked up correctly. I cleaned the ICV, but with ignition "on" it does not make any noise and you cant feel anything to the touch. I replaced all injectors while I was under the intake as well. Spark plugs are also new.

It should also be noted that the "stomp test" will not work. I'm chalking this up to a possible issue with my TPS

Is it possible that a bad purge valve is the cause of these issues? Any thoughts? Your help is greatly appreciated.

Thanks.

[Balleristic31]

Did you put a new intake boot in?

[ARsandBustedCars]

Did you put a new intake boot in?

No, but cleaned and checked thoroughly, no rips or tears.

[Balleristic31]

How's the wiring coming off the tps? I've had the pins on the connector pull out before and it caused tps issues.

[ARsandBustedCars]

How's the wiring coming off the tps? I've had the pins on the connector pull out before and it caused tps issues.

Wires look good, retaining clip on connector is still in place as well.

Edit: Pins are there

[ARsandBustedCars]

Started tracing fuel smell. I removed back seat and cover, found that the pump and surrounding area is soaked in fuel. Im guessing it needs new gasket. Ill replace pump too since im in there.

It dripped pretty good while sitting, the tank is full. It warmed up today which leads me to believe that the tank isnt venting properly or is pushing out through that gasket

Are these pumps known to die slowly, or do they just quit?

Found no fuel in the fpr vac line.

Does anyone know of the proper resistance for a working icv? Still working on getting a bentley (e36 I know)

Any other ideas?

Thanks for the quick replies balleristic, you're the shit.

[jrobie79]

Mine just quit..put a treperformance one in and its been fine for the last 3 years...did u accidentally coonect the two wires on the harness near the pasenger firewall? Its supposed to left unplugged

[ARsandBustedCars]

Mine just quit..put a treperformance one in and its been fine for the last 3 years...did u accidentally coonect the two wires on the harness near the pasenger firewall? Its supposed to left unplugged

Im having a hard time figuring which wires you're are speaking of.

[Boris3]

Check the hoses and their connections to the fuel pump. That everything runs fine when the gas cap is removed would seem to be important. Thread somewhere on problem with fuel return line clogged. Out of my expertise.


This wire should be disconnected.

[HennaE30]

Don't have any personal experience.. But it seems like your breather may be clogged, causing vacuum in the tank. Idk how to unclog it.. This is just speculation, don't take my word for any of it. Just what I think it is using my brain.


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[ARsandBustedCars]

Thanks guys, I will be checking into these things tomorrow.

Last night I found that the line I used to run from my ICV to boot was heater hose. I must have mixed my hose selection up during install It has a slight bend on its way over to the intake boot. I am fairly certain that it was able to suck shut under a little vacuum.

NAPA didnt have the correct size so I bought some 3/4" heater hose and a long spring to stuff inside. I tested the hose at work and got it up to 30 in/Hg without collapse....it wont be collapsing anytime soon.

This got me thinking...

It had occurred to me that a strong vacuum may be occurring in the tank, which is why I guessed a purge valve type deal problem. However, I had a check engine light while breifly sitting at a stop sign...I'm not sure if our ecu has an evap code.

The car was sitting for about a half hour when I decided, for no known reason, to pull the gas cap. Im wondering if that just happened to be enough time for that heater hose coming off of the ICV to cool down and not collapse.

The ICV is testing in at 8.3 ohms across the two pins, which is within spec for the two pin units, from what my research tells me. Its clean as a whistle as well. Moves freely, the whole bit.

Will an ICV cause the issues I'm describing?

I still have a feeling that this has something to do with fuel delivery.

Ive read up on some common issues for these cars and went ahead and ordered new cam position, crank position, throttle position, fpr, and pump. Also got a new O2 as the car has about 170,000 miles on her. Id still like to figure out the exact issue before I shotgun these new items.

If all goes well I'll be taking a 500ish mile round trip up to the 4th round of the American Rally championship (STPR) up in northern PA the weekend after next. These suggestions have been great, much appreciated!!