302 Running like . Still can't find issue

Topic: 302 Running like . Still can't find issue (Read 3606 times) previous topic - next topic

302 Running like . Still can't find issue

Reply #15 – August 21, 2011, 08:29:51 AM

Are you running the right injectors? What computer do you have and what Mass Air meter do you have? I have an A9P computer in my car and it's programmed for 19# injectors. I installed an aftermarket MAF so I could run 24's.

302 Running like . Still can't find issue

Reply #16 – August 21, 2011, 11:39:02 AM

Lets start from the beginning

Did you check the compression???
Did you check the Fuel Pressure
Do you have GOOD SPARK. Blue in COLOR. At the PLUGS??

Please post back and i may be able to help

Note TPS settings can be anywhere from .65-.99. Its not that critical of an adjustment as people think.

Tthat car has a BARO SENSOR NOT A MAP. Their fore no vacuum hose should be hooked up to it..

http://i740.photobucket.com/albums/xx46/proguns/001-43.jpg

BARO ON THE LEFT

302 Running like . Still can't find issue

Reply #17 – August 21, 2011, 12:08:48 PM

The MAP and BAP are the same thing...are they not? One has the vacuum connected, the other doesn't. All I did to my car when I went Mass Air to convert was to remove the vacuum hose from it. On factory equipped Mass Air cars, there's a small plastic "cap" with a hole through it placed on it from the factory to prevent one from putting a hose on it.

302 Running like . Still can't find issue

Reply #18 – August 21, 2011, 03:43:32 PM

BAP/Map are dif just because some are speed density others are MAF. MAF equipped cars have no vacuum going to the sensor. The spark in the car is fine, distributor is supply spark to all 8 cylinders...trust me i got shocked 8 different times.

Fuel pressure is right on the dot, we tested it after we checked all fuel injectors, fuel rail, and changed the fuel pressure regulator.

The computer was replaced a few months ago to match up with the MAF. The computer was quite pricey and bought from summit. I know it's the correct match up for my BBK intake and current MAF sensor.

When i pull off a spark plug wire it makes no difference whatsoever... no matter WHAT plug it is. I can pull the wire off of #1 while its running and you can't hear or see a difference. i can pull off #5 and the same thing. Im beginning to think something MAJOR is wrong on the inside of this engine. It seems like i've checked and double checked anything i think that can be wrong that is a minor fix. I've had 5 ASE certified mechanics officially give up... AAA came by 2 days ago, and they had no idea... the local for dealership (any for dealership usually sucks anyways) looked at it and was speechless... they had no idea how to work on anything that requires knowledge,...

And yes vinnie, the wires are in the right order. :)

302 Running like . Still can't find issue

Reply #19 – August 21, 2011, 04:03:25 PM

Vinnie when you converted you disconnected the hose from your map and it worked because a map reads exactly the same as a BARO sensor with the hose from a vacuum source is removed. But their is a difference in sensors they carry 2 different part numbers. But Yes when both of them are opened to the atmosphere they read IDENTICAL. Thanks

302 Running like . Still can't find issue

Reply #20 – August 21, 2011, 04:04:35 PM

Once again what is the COMPRESSION

DRY AND THEN WET???

When disconnecting plug wires its strange that the engine does not respond to that. Clearly something is wrong and i think it might be mechanical and internal. But without having hands on its difficult to diagnose a trouble like this. Can you post some video with sound. You may have a busted valve spring rocker push rod ETC. Good luck Tom

302 Running like . Still can't find issue

Reply #21 – August 21, 2011, 04:28:44 PM

It kinda sounds like how my daughter's Mustang ran when a loose timing chain jumped over a couple of teeth.
Has it ever ran right since you upgraded it?

302 Running like . Still can't find issue

Reply #22 – August 21, 2011, 04:53:26 PM

I saw the two different part numbers, but isn't the "E6" and E7" prefixes the model year of the part?

302 Running like . Still can't find issue

Reply #23 – August 21, 2011, 05:27:13 PM

I would listen to Tom, he has been right and corrected me more times in the last week than I have suffered in most of my life. He knows his shiznit.

302 Running like . Still can't find issue

Reply #24 – August 21, 2011, 05:39:34 PM

When I first saw the symptoms, I thought your EGR valve might be stuck. Then when I saw EGR in your list of codes, I really thought it might be stuck :)

Pull that EGR valve and see if it moves freely. If it gets stuck open, your car will idle like (if at all).

302 Running like . Still can't find issue

Reply #25 – August 21, 2011, 06:14:52 PM

Tell us a little on the backstory of the engine itself.
Is it a converted SO? Different cam? What about the timing itself? Were the marks on the cam and crank aligned? How about the distributor? Since you have fuel and spark, it sounds like something is out of time. My buddy had a '90 Stang that was stock except for a Cobra intake...it ran just as yours is...turned out the timing chain slipped or somehow it got itself way off time. It wouldn't idle, smelled of raw gas, ran like shiznit, and sounded like it too. He yanked it, pulled the front cover off, it was off by several teeth.

Not exactly sure this your problem..and it probably isn't, but might be worth a thought if nothing else pans out...

Just sayin'...someone else may have worked on it and not got something right.

Edit..EGR doesn't affect idle..

302 Running like . Still can't find issue

Reply #26 – August 21, 2011, 06:15:29 PM

Not sure about compression, but the EGR is fine. It's been replaced 3 times now with NEW ones and used ones that have been tested.

Also, that was one of my next assumptions is if the chain skipped a couple of teeth... would i just had to take out distributor and re adjust that?

302 Running like . Still can't find issue

Reply #27 – August 21, 2011, 06:18:08 PM

Yeah the more and more i try the things on my list of ideas and nothing works, i lean more towards the timing chain skipping a few teeth. The engine has always been fine. It came out of a 1993 cobra, and has never had issues. oil changed every 3,000 miles. It goes to a mechanic every 5 months or so. It's hooked up to live diagnostics at our shop every 2 months for shiznits n giggles.

We have spent plenty of time working on this thing... I'll post a video up of the sound when i get a chance

302 Running like . Still can't find issue

Reply #28 – August 21, 2011, 06:20:42 PM

If the chain jumped the compression will be low. Readjusting the static timing wont fix that. I have seen the cam pin shear in some engines. Do a compression test it might shine some light on the Subject Thanks

302 Running like . Still can't find issue

Reply #29 – August 21, 2011, 06:23:58 PM

Right..if the timing chain has slipped, it's either loose, or otherwise needs replaced. Short of a compression test as Tom suggests, the only other way to see would be to pull the front cover and get a visual. It may be time for a replacement chain anyway..