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Silver
08-04-2007, 09:53 PM
Who's good with the 4.6L SOHC?

Ok so I have been having a rough idle and surging below 3k rpm untill vehicle warms up, since my CEL is blown (bulb) I got my car scanned at Auto-tards.

I don't recall the name but it has something to do with the air to fuel mixture causing the rough idle. I also have EGR excessive flow, but I've had that for years now. I've cleaned the channels also.

Recently I did a harsh (thru shrader valve on fuel rail) fuel injection clean.

The car idles rough and it feels like there is a dead cylinder when first cold. Intermittently I get a backfire or hear a LOUD pop from my Intake tube. It goes away within one minute.

When I first start the car it idles fine around 1k rpm. Soon as the IAC adjusts and dips rpm it starts shaking and misfiring away. Then at 1/2 throttle it sounds like a dirty maf would, ect. At WOT the misfire goes away and comes BACK when i let off throttle.

One thing I do notice. The motor makes a "click" noise and the car runs fine after that like almost something is being stuck shut @ 3/4 or below throttle.

I have NO IDEA what to do. Could I have killed an injector? If so, what would diagnosis mechanically for a fuel injector be?

So far I've cleaned my maf, replaced plugs wires, tried another fuel injection clean, checked torque converter (before code was thrown), checked valves (bad guides, burns oil), compression test. Everything check out OK. A long time ago the car had a rough idle and my pops messed with the set screw on the throttle body (this was 3-4 years ago). I dunno if the ATF mixture is incorrect now.

This problem is bugging me pretty bad now, because I was leaning towards fuel injectors untill that code was thrown.

Please help!!!

LoudCrownVic
08-05-2007, 11:09 AM
Wow, ***** to hear the probs you are having wit your tbird.

I'd say that given the problems I had with my Crown Vic, it's quite possibly an electronic issue.

You might have to replace the Mass Airflow Sensor.

The only problem i remember I had in my Crown Vic when the MAFS went out was strange throttle response, mind you.

I have no idea how you would check it but I assume that there is changing impendance or voltage that moves through the wires from the sensor as the airflow changes, stable at idle. Whle the car sits at idle and your voltmeter/ohmeter is bouncing or eratic, you could have your problem right there. Of course I will stress again that have no idea how you are really supposed to check the MAFS, you will want to look that up. The readings from OTHER sensors might affect this one. And MAFS are not cheap. It was like 400 bucks with diagnostics to fix mine. If you do replace it you might as well look into one of those Granitelli motorsports ones that give you a performance boost.

If the code read as a problematic air fuel mixture, I wouldn't be suprised if this is to blame.

Another thing that can cause engine bay electronic mayhem in general is bad grounds. Like all those little grounding staps here and there to the body or the block can go bad and cause all kinds of erattic readings. I doubt this is your problem though.

mapolley07
08-05-2007, 11:14 AM
check your exhaust system too. my dad's grand marquis idles rough with a busted catalytic converter. one of your cats could be busted or blocked. if you have no emissions testing in your area, remove the cat and replace it with flexpipe or straight pipe.

Ferendon
08-06-2007, 05:48 AM
IAC/IAB valve. Very common issue on alot of Fords. That wouldn't be the problem if it continues when you touch the gas, but it might be contributing to the idle problem. MAF sensor is a good place to check, and I'd recommend checking for a fouled plug or 2. The FI cleaning may have been nice and cold, which may have damaged a spark plug, or possibly even an injector.

Silver
08-06-2007, 07:57 PM
Update, for the first time it didn't do it at start up. Only difference is it was raining out and very humid. Which is very odd.

I already looked at the IAC, I don't have a tool reader so I couldn't diagnose if its working properly.

I think I am going to clean it first. I also am going to replace the EGR valve and the DPFE sensor to clean that code up. I'll report back.

LoudCrownVic
08-08-2007, 02:14 PM
Good I'm curious to see what happens!

Silver
08-08-2007, 11:06 PM
Cleaned the IAC, everthing is working good.

azbass
08-08-2007, 11:12 PM
I car nut need of a?

Silver
08-08-2007, 11:31 PM
I car nut need of a?

It was suppoed to say. "In need of a car nut."




***.

Beat_Dominator
08-08-2007, 11:45 PM
First thing that came to my mind was MAF or Oxygen sensor..... but it sounds like you're getting it figured out :)

oglejust
08-08-2007, 11:49 PM
egr valve will make it run rough

blimblam
08-08-2007, 11:49 PM
i got the same problem! people kept telling me thats the problem, IAC valve. what did you use to clean it?

Silver
08-08-2007, 11:51 PM
egr valve will make it run rough



Correct, espically if the valve is stuck open. Will cause a lean condition.

I'm replacing it soon, I cleaned the channels 3 times due to carbon cloging.

LoudCrownVic
08-09-2007, 01:25 AM
I demand T-Bird pics.

Silver
08-10-2007, 08:42 PM
Nothin special man, trust me. Here ya go though.


http://a374.ac-images.myspacecdn.com/00921/37/39/921239373_l.jpg
http://a208.ac-images.myspacecdn.com/images01/126/l_fc6c0a9d95caddde7b12cb399a46967f.jpg
http://a485.ac-images.myspacecdn.com/images01/73/l_8384f77dca9b3dc7218391a5290be12c.jpg
http://a610.ac-images.myspacecdn.com/images01/29/l_551b524a6fff2738b803b1318ced2ed1.jpg
http://a102.ac-images.myspacecdn.com/00921/10/12/921232101_l.jpg
http://a552.ac-images.myspacecdn.com/images01/2/l_84b2373657503cde49ccf1821b75481f.jpg

SuperCoupe Rear Bumper on its way.

Trans I put in it. (4r70w) Stang trans.
http://a615.ac-images.myspacecdn.com/images01/28/l_82210270bdd9255805f8fe60c4639b06.jpg
http://a335.ac-images.myspacecdn.com/images01/14/l_75b52f534c32e83ae411749eb0845c1e.jpg

regal8r
08-10-2007, 08:44 PM
OT but arent you a tech at a GM dealership?

Silver
08-10-2007, 08:46 PM
Yea. Notice the uniforms =).

I get that all the time haha. I'm savin up for my next car though. Being in college ***** ***.

regal8r
08-10-2007, 08:48 PM
also, when you mess with the screw on the throttle body, it will set a code in the PCM unless you go in there and change something..its been a while since i was in tech school so i really dont remember...lol

Silver
08-10-2007, 08:49 PM
Yeah, I took a look at it and adjusted it a little bit.

PCM was throwing a TPS sensor code also. I knew that was because of my pops doing things his "old school" way lol.

regal8r
08-10-2007, 08:50 PM
Yea. Notice the uniforms =).

I get that all the time haha. I'm savin up for my next car though. Being in college ***** ***.
that ***** that isnt a GM cuz then you could just take it to work and strap the TECHII on it :D

regal8r
08-10-2007, 08:52 PM
Yeah, I took a look at it and adjusted it a little bit.

PCM was throwing a TPS sensor code also. I knew that was because of my pops doing things his "old school" way lol.

these dern newfangled cars with all kinds of computers n such:nerd:

Silver
08-10-2007, 08:54 PM
that ***** that isnt a GM cuz then you could just take it to work and strap the TECHII on it :D

Autozone got me the codes for free. So I searched around a little bit on TCCOA and found a couple diagnostic flow charts and alldata had some bulletins on a similar problem with the vehicle.


Tech 2's are leaving soon. All gonna be labtop.

regal8r
08-10-2007, 08:57 PM
Autozone got me the codes for free. So I searched around a little bit on TCCOA and found a couple diagnostic flow charts and alldata had some bulletins on a similar problem with the vehicle.


Tech 2's are leaving soon. All gonna be labtop.

techii's can **** my **** anyway, im a big fan of the modis :D

have you taken a stethoscope to the injectors to see if each one is pulsing?

Silver
08-10-2007, 09:00 PM
Noid light & stethoscope all a-ok.

I already fixed it :).

regal8r
08-10-2007, 09:04 PM
oooOOooo what was the problem? even though its already circled on the grille lol

Silver
08-10-2007, 09:09 PM
Simple IAC clean.

regal8r
08-10-2007, 09:38 PM
Simple IAC clean.

lol...i was gonna suggest a 3 part clean, which would have covered that :naughty:

LoudCrownVic
08-10-2007, 11:46 PM
Niiiccce! +1 on the tbird.

What is the difference in the transmissions? Your first one blewd?

Silver
08-10-2007, 11:52 PM
Yea, it was re-build with stronger clutch packs, misc things. Also drilled out seperator plate.

J-Mod.

FineLinePimpin
08-30-2007, 05:50 PM
Most dont know but the 4R70W is basically same as the AODe but with a wide ratio gear set. If i keep my current stang long enough I'll go to a 4R70W swap.

DBfan187
08-30-2007, 05:52 PM
Did your car get the Tom Green treatment?

Silver
08-31-2007, 11:13 PM
Do I wanna know what that is lol?

DBfan187
08-31-2007, 11:13 PM
He only has 1 nut now.

Silver
08-31-2007, 11:14 PM
Most dont know but the 4R70W is basically same as the AODe but with a wide ratio gear set. If i keep my current stang long enough I'll go to a 4R70W swap.

I wouldnt. I'd do a T-45.

Only reason I did it. Had a buddy with spare parts. 350$.

Silver
08-31-2007, 11:15 PM
He only has 1 nut now.

LOL. uni

Ferendon
09-03-2007, 04:01 AM
tremec t56 FTW...

Silver come on over to fordbastards.org sometime

We'd love to have more T-Bird drivers.

FineLinePimpin
09-03-2007, 11:11 AM
tremec t56 FTW...

Silver come on over to fordbastards.org sometime

We'd love to have more T-Bird drivers.



Holy crap ferendon...i thought you were kidding about that website lol. I just sould my super coupe.

Ferendon
09-03-2007, 04:30 PM
We don't mind Mustang guys too much either...

FineLinePimpin
09-04-2007, 11:25 AM
I wouldnt. I'd do a T-45.

Only reason I did it. Had a buddy with spare parts. 350$.

Well a T5 swap would be way more ideal than a T45. But if i keep it and am able to do what i want its going turbo and a automatic make it easier to brake boost on a launch without using a transbrake or launching way high with a stick.

Ferendon
09-04-2007, 02:45 PM
On drag cars, a good, solid auto is the way to go. I would have never believed that 2 years ago.

FineLinePimpin
09-04-2007, 07:13 PM
A built auto can be faster and more consistent than most your averge clutch operated manual trans' could ever dream of being. Now if we are talking Lenco,Liberty or G-Force clutchless than thats different and also "up the anus" expensive.

Silver
09-05-2007, 08:11 PM
tremec t56 FTW...

Silver come on over to fordbastards.org sometime

We'd love to have more T-Bird drivers.


Will do.:nerd:

azbass
09-05-2007, 08:11 PM
wait ,.

I need of a Car nut. ?