Help with stumbling engine

[skimp930]

The past few weekend I've been troubleshooting my turn signal issue and in the process I fubared something. When I first crank the car, the engine started to stumble and my rpm starts bouncing from 600-900 rpm. If I recall correctly, everything was fine up until I replaced the blower fuse, in the engine compartment. While I was replacing the fuse (which is not easy - tight space), I manage to drop my fuse (right next to the fuse box) and i had to fish it out with my hand. It was pretty tight space and I had to shift through some wires and hoses to retrieve it. I'm thinking I may of pushed something loose while fishing for it but I'm not certain. Any thoughts on what i should check? I know the car was running a bit rich but was running strong prior to this incident.

Thanks,
Sean

[PrimeMvr]

Do you still have the stock lambda system operating? The O2 sensor connector is in that area.

[Miguel Antonett]

Check the waste gate hose connection to the IC and spark plugs cable/cap for looseness. The engine harness also goes to that fuse box, so should check all pin plugs are properly engaged.

[mooney265]

If i didn't have a wide-band O2 and CIS gauges, I'd not have a clue about any of the goings on with my car... That being said, I'd put my money on the car running a bit too rich at idle.

Q: is the "stumbling" occurring when the engine is cold? warm? or both?

Possibility: WUR has lost power??

[skimp930]

Thanks for the suggestion. Not for certain but it appears some of the 02 system has been disconnected. I currently have a straight pipe with no O2 connected and I have no idea if it stall has the stock lamda system. How can i tell if it still does?

A brief history - I purchased the car about 10 months ago and I'm still trying to get to know that car. Here is what I know so far about the car:

1988 930S
Stock 3.3 engine (rebuilt ~3 years ago)
BB Headers/straight pipes
Larger intercooler
1 bar spring (I'm assuming as it hit 1 bar consistantly)

I took some pics hoping someone can see anything suspicious but first here is a pic of the car...




Here are some pics of the engine bay...


Moisture...oil leak?


This clip(pic above) was not connected to anything...not sure what it is...


This was disconnected which i plugged back in...





Here is the video of the engine running when start cold. I afraid to drive it or keep it running at this condition. I also noticed it starting to smoke quite a bit.

930S engine sound - YouTube

Sean

[wjfk32]

Unplug that o2 sensor connection. The smoke is probably condensation..Sounds like not enough fuel-starving..double chk all connections in the plus a spot light..Get a chair and take your time..once done start it up..and rev it up..hold the revs 3000rpm..then give it a good tap down and see what happens..if rpms not at 900_or 950 not smooth shut it down..keep chking...i had a problem similar sound. + in the end my fuel head was gummed up..i religously use mmo on every fillup. my car does sit sometime 2-4 weeks..

[wjfk32]

Like miguel suggested..plug wires..u want to hear that click sound when pushed in..

[oilonly]

Did you happen to push the spark plug wire grounds against your coil terminals when working under there? Did you bend any relays out of position?

It was pretty tight space and I had to shift through some wires and hoses to retrieve it.

If it was me I would remove the intercooler and have a better look see at how everything is sorted out.

[skimp930]

Miguel and wjfk - Thanks. I'll check the plug wires.

Mooney - I haven't tried to drive the car worried that i might do damage. It's been happening when i first start the car. Temp here in GA was been getting cooler...not sure if that has an influence.

Oilonly - Possibly. I was hoping i can solve this without pulling the intercooler but I have a feeling I might have to. Never done it before...hope it's not too difficult

After work I looked around the engine bay again and i notice this...

It was not secured in or sealed. I just pulled it out by hand. Thought this was odd...Is this normal?




Also notice there was a lot of moisture around these hoses. Hopefully nothing major.

[oilonly]

where is that line coming from the bottom of your air cleaner going to skimp? And taking off the intercooler is very straight forward, you should do it just to check your rubber 0 rings out.

[aerodyn930]

Hello sean, There is a chance that you may have disconected the wires at the Thermo time switch, Located in the left chain housing behind the turbo inlet tube,
It resembles a sensor and it has two wires connected to it,
From the starting symptoms you describe (especially with the cooler temps)
the auxiliary air valve is not operating, thus you will have low fluctuating idle until engine reaches operating temps,
BTW it is very hard to access, You may need very long thin needle nose pliers,

let us know what you find, lou

[skimp930]

oilonly- The line is going to the oil catch can. I feel the line to the air cleaner should be in tight and secure and not just hanging there. I'll go ahead and take off the intercooler and investigate further.

It's a georgous day today in GA...70 degrees and nothing but blue skies...perfeck driving condition. Hope to get her out soon.

Lou - Thanks for the suggestion. I'll check out the switch...sounds like the symptoms I'm having.

[skimp930]

Forgot to mention, which i thought was odd... when i turn off the engine after running for a few minutes, it continues to run for a couple of second at which time it reevs up and then shuts down. Which never happened before.

[oilonly]

Originally Posted by skimp930

Forgot to mention, which i thought was odd... when i turn off the engine after running for a few minutes, it continues to run for a couple of second at which time it reevs up and then shuts down. Which never happened before.

You might have nocked your ignition delay relay around when playing with that fuse.

2 threads here on this relay.

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/631030-run-dieseling-causes.html



http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/613561-dieseling-shut-down.html

[oilonly]

oilonly- The line is going to the oil catch can.

Is it lined with oil, what I mean is does it seem like oil has been passing through it? It looked oily to me.

[skimp930]

Well...shhii*t. Someone please kick me. I think i found my problem. After backtracking everything I did and trying to tighten everthing I can. I remembered I replace fuse #2 in the engine compartment, as it was broken. I took the fuse off and turn on the car and voila...everything back to normal. I was estatic but confused as i thought fuse #2 was the blower fuse. Shows how little I know of this car. Thank you to all who helped. Learned quite a bit going though this process.

On a side note. After going through all the hoses and wires in the engine bay, I did notice the blue hose connected to the interooler (pictured below) was saturated with oil. There were a few drops of oil forming on the bottom of the hose. Which may explain some of the oil leaks. Is this hose prone to oil leaks? It appears there's quite of bit of oil on and around the hose. Can't say for certain it's all coming from that hose but it sure does look it. Is this a sign for other major issues or can I just replace the hose and move on?

[skimp930]

oilonly- The hose itself was dry but the hose below it (blue hose from the pic below) is drenced in oil. Can't tell if it's from the air filter (if that much oil can come out from it) or the hose itself is cracked. I was going to let the car idle and see where it's leaking from.

Sean

[oilonly]

Should not be any oil like that there. Maybe a film of oil but not like what you say. I would bet your intercooler is full of it also. I say remove intercooler and boost pipe, look down into your turbo with flashlight and see if standing oil is in it. JMHO let others chime in. Glad you found out your original problem.

[oilonly]

Skimp what is your oil level at? It just might be your oil level is too high.

[mooney265]

Originally Posted by oilonly

Skimp what is your oil level at? It just might be your oil level is too high.

Also, you should check your oil while the engine is hot hot and running at idle. If the oil level is near the "full" level on the dipstick, your probably getting oil in the intercooler and then it's draining through that hose...

It's really not that hard to get the intercooler off. Be sure you have some extra o-rings handy [or a source] and always use a liberal application of wheel grease [or something like that] on the o-rings when you re-install. Also, be careful tightening the bolts holding the intercooler to the manifold because it's easy to break the casting...

Whenever I work on my engine, I usually take the intercooler off immediately, so that I have access to the engine...