Finished!! Forged piston block, Custom valve head (flowbenched)

[XxPichulonxX]

Best of luck to ya in your quest! I got exhaust problems of my own... stupid downpipes.

[Ondonti]

anyone know why my plugs always foul after the car sits for a few days???

Car seems to have done it for the millionth time today.
I dont like spending $ on new spark plugs whenever I want to drive. even though Im using cheap ones. I dont know how to avoid this problem.

car starts up and vacuum will real low so I know its not running right. if I unplug the fuel injector harness and turn the car over it will run for a second then die (all the unburnt fuel) then plug harness back in and the plugs instantly foul again.

---------------------

Well I replaced the plugs. Not the problem. It seems I am having that fuel injector flooding problem again. I dont quite understand why it all of a sudden happens. I wish I knew what wires were having problems (or more likely where)

[87turbodance]

Quote:

Originally Posted by Ondonti anyone know why my plugs always foul after the car sits for a few days??? Car seems to have done it for the millionth time today. I dont like spending $ on new spark plugs whenever I want to drive. even though Im using cheap ones. I dont know how to avoid this problem. car starts up and vacuum will real low so I know its not running right. if I unplug the fuel injector harness and turn the car over it will run for a second then die (all the unburnt fuel) then plug harness back in and the plugs instantly foul again.

Just a guess but it sounds like you starting PW is too high - aka you're running too rich. I imagine you have less idle vacuum with your re-ground cams. I repeat myself but honestly I think a recal or MS is the answer

[Ondonti]

Um, low vacuum is not the problem, it is the evidence of a problem (the obvious cylinder misfire) because I know what vacuum should be.
vacuum is usually 13.8 to 14.4 when running decently. Its also running a lot richer on the wideband then.

When the engine is misfiring like it is now (cylinders not firing) vacuum drops and A/F ratios get leaner because oxygen is not being burned.

so it just seens that maybe 2-3 injectors are shorting on themselves so they are opening more often then they should. I had this problem before and it was on cylinders 4 and 6. The plugs were too dirty this time (had 100 hard miles on them) to really tell what was happening.

I only say that because I have found that problem before.

Could be another problem like you are mentioning though..

[mopar3.0]

yea ide say a ms and play with the cold start settings will solve your issues,
what size injectors are you running?

[Ondonti]

Its not a problem of the stock ECU not being compatible with the engine, it is an electrical problem.
The engine normally runs just fine.

MS is a project that I am not working on till the race season is over.

[Ondonti]

Since my custom intake manifold allows me to easily unplug the connectors from my fuel injectors....I can make the engine run on just 2 cylinders.

4 & 6 must be fouling out bad or something. I can run the engine on just cylinders 1 and 2.....and also on just cylinders 3 and 5.

When i have the engine running on

4, 6 and any combination of 1 2 3 5 it runs horrible

Run the engine on JUST 1 2 3 5 and the engine behaves just the same as if all 6 injectores were plugged in.

So 4 and 6 are fouling out or getting too much fuel or something.

I know the injectors are not stuck open because I had this problem before and they were not leaking then and when i swapped injectors into this intake manifold I did not keep them in the same order.
I also tried a different ECU.

On a lame note....my 3.5L dodge AIS motor seems to be stuck open.? anyways its not my main concern.

[87turbodance]

By saying that MS is the answer I mean that you can start fresh and have full control of the tune rather than running an engine with a speed density ECU that is not tuned for the motor. Also gives you a chance to go through the wiring and datalog anything that looks strange. I know it's not in the cards for this year but once you get MS up and running for next year you'll never look back. The wideband will be a dream come true with MS because of the A/F target tables and datalogs. Myself, I would rather spend the weekend installing MS and new injector wiring then driving myself crazy with fouling cylinders that could be caused too many unknown variables.

[Ondonti]

yeah so

I think you guys can forget everything I said.

I just about killed myself. After a bunch of testing I decided to just drive it and see if it was misfiring.

Well.
I stupidly did a 1 2 3 pull down the block. then had to slam on brakes for red light BUT
NO BRAKES.
the air line poppd off.

I am just really really happy I started braking early. I somehow stopped for the light. What sucked is driving back around the block some assholes were jaywalking right in front of me (NOT driving fast anymore) but I still cant stop for crap. Gotta love college towns

Anyways the vacuum reference for the brakes is off.

It might have gotten pulled off when I was fixing the manifold. Anyways the boost sensor is teed into that vacuum line so this would make sense why I had horrible vacuum. I will have to try it now.

[Ondonti]

Sooo, Even though I checked all the vacuum ports on my wastegate, BOV, fuel regulator, engine, MAP

I didnt check the connection @ the brake booster when the low vacuum should FIRST indicate a vacuum leak and not and engine problem. I can admit that the engine did not sound like it was missing when i was doing small revs on it when troubleshooting.

So that was a horrible mistake and NOT something I should have found out was the problem while driving on public roads.

[87turbodance]

so it was a vacuum related issue then... makes sense

[Ondonti]

Yeah. I even checked that line where it plugs into my vacuum lines on the intake manifold...I just didnt notice that it was hanging a bit to limply.....cause it wasnt plugged into anything.

Well all I can say is that with the air intake and the cams advanced this thing is freakin scary again and not just when the brakes are broken.

Now I have to be careful because I dont know what the a/f ratio will be like on the engine anymore now that it is running correctly.

[m90daytona]

its weird that thing wsnt idling at 3k. must have been a small vacuum leak. glad you found it.

[Ondonti]

It was a big vacuum leak.........I turned the throttle stop way in to get less air and I thought that my AIS was stuck open.
RPM's were like 1800-1900 when I first started the engine.
One thing to note is that big vacuum leaks seem to make less of a difference on this motor. Same reason why my spirit idles @ 2700 rpms with the throttle stop setting I had on my duster for 900-1000 rpms

I just ignored the obvious signs

[XxPichulonxX]

Quote:

Originally Posted by Ondonti It was a big vacuum leak.........I turned the throttle stop way in to get less air and I thought that my AIS was stuck open. RPM's were like 1800-1900 when I first started the engine. One thing to note is that big vacuum leaks seem to make less of a difference on this motor. Same reason why my spirit idles @ 2700 rpms with the throttle stop setting I had on my duster for 900-1000 rpms I just ignored the obvious signs

Obivious solutions aren't so obvious until someone comes along and points them out. It happens to me all the time.