Author Topic: no start, plugs fouled within seconds (Read 9861 times)

jakeb · « **Reply #15 on:** December 20, 2010, 11:10:07 AM »

tried unplugging the trans computer...no help.

DesktopDave · « **Reply #16 on:** December 20, 2010, 01:47:17 PM »

Did you tone out the harness, just to see if your connections are all tight? Any possibility of cross-wiring?

jakeb · « **Reply #17 on:** December 20, 2010, 04:22:45 PM »

yup... I have checked and triple checked from the harness back to the dme connector. I swapped the injectors for another set I found...the ones in it now are e36 injectors. cleaned the plugs, hooked it all back up and it did run for a little bit longer, poorly but it did run. Then stalled...

Thought I would check the o2 sensor...black as could be and wet with I assume fuel...swapped in another one. No go....

Pulled the downpipe thinking maybe there was some restriction and when I cranked it I have flames coming from the exhaust manifold....it started for a few seconds. Cranked again and nothing....

It is almost like when the fuel is going in it is building up so much compression it cannot overcome it. It is sorta hard to explain.

Unplugged the AFM....no go, the dme did give me a fault for it being unplugged tho
Unplugged the knock sensors....no help

I am thinking of going to pick up a leak down tester and checking to see if the valves are bent and thus leaking. Would an engine still build compression with bent valves?

dj91318is · « **Reply #18 on:** December 20, 2010, 06:21:07 PM »

Quote from: jakeb;99769

One thing that I have done different with this swap compared to others is that I had to lengthen the fuel injector harness to work with the intake I have to use. So....I cut, added wire, soldered, and heat shrink-ed the connection on each wire. Not sure why that would cause a problem but it is possible I guess....

I am at a loss.....

Swap what? Lengthened Injector Harness? Sounds like the fuel injectors are all open never closed, Short / Signal to stay open all the time, some how.

Wish I could tell you what to check.

WOULD A CLOGGED return FULE LINE CREATE ENOUGH PRESSURE TO OPEN THE INJECTOR'S? or the inlet and return fuel line are backwards on fuel rail / FPR.
GL dj

jakeb · « **Reply #19 on:** December 20, 2010, 07:35:04 PM »

This engine is in a 1973 BMW 2002....
here is a pic of what I am working on....

I do have another harness I could put on and see...

I just went out and bought a leak down tester and it is coming up with around 20%.... not sure if I trust the gauge on it so I need to get a little different gauge tomorrow. But if 20% is right it sounds like it is something with the engine.

MLM · « **Reply #20 on:** December 21, 2010, 03:38:50 PM »

Another idea may be to check the temp sensor...

It may have failed in a way which registers as very cold ie cold cranking fuel is at a maximum hence the over fuel..Not even sure if its possible just an idea

jakeb · « **Reply #21 on:** December 21, 2010, 04:51:24 PM »

I thought that too..... I checked the sensor and it checked out via the bently.

I am going to swap in a different engine and harness. While I am doing so I am going to check over EVERYTHING...all the wiring, fuel, grounds, etc etc. So pretty much just start over..... The engine that is in there now didn't look very clean under the valve cover anyway and the other one I have on hand looks brand new under the valve cover...so...

jakeb · « **Reply #22 on:** January 02, 2011, 12:51:03 PM »

it runs!!!!!!!! Idles very smoothly, all is right with the world once again. Happy 2011!!

I swapped in another engine, this one looked way better under the valve cover. Also better leak down results.

When I pulled the other one out and had to swap over the crank pulley I found that the old engine had play in the crank where it would move in and out 1/4 - 1/2" so I think that other engine was just a POS.

DesktopDave · « **Reply #23 on:** January 02, 2011, 09:30:07 PM »

Glad you found the trouble...sorry it was a whole motor. 1/2" is a lot of end play.

What kind of condition are the cam sprockets, tensioner & chain guides? Chain case looking OK? If you're going to trash the motor and they look OK I'll send you a few bucks so I can have a spare set.

jakeb · « **Reply #24 on:** January 03, 2011, 10:41:16 AM »

If I decide to part it out I'll let you know. I am going to put it on a stand and see about mocking up a SC I have laying around.

DesktopDave · « **Reply #25 on:** January 03, 2011, 05:10:13 PM »

Ooooh. Post pics! Are you doing something like the little Merc magnetic clutch-driven one, or something bigger?

jakeb · « **Reply #26 on:** January 04, 2011, 04:30:55 PM »

eaton m90 i think from a ford supercoupe. Unless I can find a rotrex for a good price. I would really rather use a rotrex or VF so I can just have a plate cut and bolt it to the front of the engine.... still up in the air right now. It has been a project in the works for a couple years. I have other projects that may happen before that....such as a fiat 500 with a mid mounted FWD honda engine and tube chassis....

also sounds like i will have an m42 swap into an e21 soon...

jakeb · « **Reply #27 on:** January 09, 2011, 05:21:21 PM »

all is good and the car is running and driving.

Here is a pic of the car the engine is in...

DesktopDave · « **Reply #28 on:** January 09, 2011, 06:34:04 PM »

Nice roundie. I miss those old cars. They were never all that common, but I've only seen one out driving over the last four years or so. Makes me want to check out Craig's List for some postings. Such an iconic car.