M20b20 running rich.

[Onure30]

I was having trouble with my e30 with rough idle and lumpy running, i sorted that out and now i have alot of smoke and it stinks of fuel when running,

[Speedtouch]

Have you measured the blue temp sensor readings at the ECU socket? Just fitting a new one may not solve the issue if there is a break in the wiring or bad connection, because the ECU won't be able to 'see' it.
https://www.e30zone.net/e30wiki/index.p ... emp_Sensor

[Onure30]

I checked all the wiring at the c191 plug and also from c191 loom to ecu end and all checked out.

Im leaning towards injectors,
Maybe one or two is stuck or leaking, the car has been off road since 2006. So things have probably started to fail.

[Speedtouch]

Yes, could be. A first check you could do is measure the impedance of the injectors, using a multimeter. Perhaps also run some injector cleaner in the fuel also, and give it a good revving.

[Onure30]

So i have an update,

2 injectors where faulty, one is stuck closed and tye other is stuck open.

[Speedtouch]

Ah, good spot.

[Onure30]

Now the problem im facing is that i thought i had b20 injectors and someone said that they are from a b25 0280150715.

Can i use these on my b20? Or is there any sort of chip that i can buy which is fuelled for m20b20 using b25 injectors?

[Speedtouch]

Who was this "someone"? I would check them yourself to be sure of what are actually fitted.

I suspect that if M20B25 injectors are indeed fitted to an M20B20, this could cause rich running.

As quoted in the Zone Wiki: "Injectors do not need to be upgraded, and there is no benefit in fitting bigger injectors to a standard E30 engine. Many people believe that M50 injectors are an upgrade; they can be, but only if the rest of the engine has been substantially modified already and remapped accordingly. Fitting bigger injectors alone will only result in rich running, causing damage to your engine in the long run."

[flybynite]

Now the problem im facing is that i thought i had b20 injectors and someone said that they are from a b25 0280150715.
Can i use these on my b20? Or is there any sort of chip that i can buy which is fuelled for m20b20 using b25 injectors?

AFAIK The Bosch 0280150715 is not listed for the M20B20, as above it flows too much for the car. You cannot make a B20 take B25 air with a chip, it doesn't have a turbo.

You may be able to do a custom calibration to re-map the injector duration but surely it is easier to just fit the correct injectors?

[Speedtouch]

This thread from a while back may be of interest:
viewtopic.php?t=272218

[Onure30]

I bought the car like this so it must be the previous owner who put them on,

I got the car to run good now, i adjusted the afm a little and now its running really well, not rich at all for the time being im going to have to keep these injectors in until i source b20 ones.
I think i have a set in my other garage but ill need to find them.

[Speedtouch]

Well done, sounds pretty good.

[Speedtouch]

Well done, sounds pretty good.