I give up...M50 swap rus like ass!

[e30s50dan]

im wondering if dirty or leaky injectors are causing the condition,since there was bad gas in tank

[Under_Pressure]

If it idels fine then it's not mechanical. It has to be something electrical. So u can rule out gas and injectors. I suespec timing... Or related to it. Check your cam position sensor and or tps.

Please understand I have NO knowledge on BMW engines but if there anything like te rest it's the same. Giving I know that they don't use map sensors instead the use maf's.

[e30s50dan]

If it idels fine then it's not mechanical. It has to be something electrical. So u can rule out gas and injectors. I suespec timing... Or related to it. Check your cam position sensor and or tps.

Please understand I have NO knowledge on BMW engines but if there anything like te rest it's the same. Giving I know that they don't use map sensors instead the use maf's.

but i have NO Check Engine Light,so I would think if it were a cam/crank sensor the light would at least "blink"

[2002maniac]

but i have NO Check Engine Light,so I would think if it were a cam/crank sensor the light would at least "blink"

not always. Test them with a multimeter.

[Under_Pressure]

never trust cells! My friend has a 2001 ford with a nasty missfire and it has no cels either.

[e30s50dan]

Ok came home started car and drove it right away and it runs perfect Cold till near redline. 2 min later starts to sputter in all rpms so only when it starts to warm up it runs like ass. What the hell !!

[Mstngcobr761]

Ok came home started car and drove it right away and it runs perfect Cold till near redline. 2 min later starts to sputter in all rpms so only when it starts to warm up it runs like ass. What the hell !!

Kind of sounds like your o2 sensor is fine until it heats up, causing it to go open. Sending the ECU bad signals

[bmwguy87]

Where in NC are you maybe me and a buddy could come by and check it out. We have done about 6 swaps for people. PM me.

[e30s50dan]

Kind of sounds like your o2 sensor is fine until it heats up, causing it to go open. Sending the ECU bad signals

i quess its possible,no CEL though,i could discount it and see..will only run rich

[e30s50dan]

Where in NC are you maybe me and a buddy could come by and check it out. We have done about 6 swaps for people. PM me.

dude,im 5 hours away,near the BEACH! OBX baby! thanks anyway :-)

[Mstngcobr761]

i quess its possible,no CEL though,i could discount it and see..will only run rich

When I was in school my diagnostics teacher talked about a car that was doing that and wasnt throwing CELs

[e30s50dan]

thanks, i will pull the O2 sensor off tomorrow and see how the bitch runs

[E3Oslut]

o2 or cat...

[Under_Pressure]

If it's a cloged cat it would turn red from heat when pressing the gas. Giving the symptoms it's unlikey that's the problem. 02 maybe on bmw's a honda would run on a safe map "limp mode" fine.

[Jette_man]

It sounds like it is dropping spark. You could have a coil shorting out when it gets warm. Try changing the coils one at a time with a known good.