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Old 01-05-2004, 02:44 PM   #1
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Nobody can fix it...please help!!!

Ok i have been to three different shops and nobody can fix my car. I have a 00 auto v6 with straight back duals and the denscharger ful length intake. After the car is warmed up it makes this knocking sound when I accelerate. It is not detonation but has suomthig to do with carbon build up. One place replaced the EGR valve (whatever that is) and it was fixed for about 3 days but then came back. Also when I start the car smoke comes out the left tailpipe and it stinks. If anybody knows what the hell is wrong with my car any help would be appreciated. Thanks!
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Old 01-05-2004, 02:54 PM   #2
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is it white smoke or dark smoke? White smoke you might be leaking oil into somewhere your not suppose to be.... somewhere in the left side of the block maybe?

Not an engine tech but just my .02
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Old 01-05-2004, 03:02 PM   #3
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Ok you have to look at the problem Knocking under acceleration. Fuel/ Air and timing would be the culprit if the EGR was replaced. if your right cats are plugged you will have no flow in that side of the motor over rich condition causing a fuel burn problem but not usually a knock unless the fuel is is puddling in the cylinder and igniting. Possible fuel starvation from clogged fuel filter or fuel pump dying causing lean condition and detonation. very dangerous if this is happening. Could have a faulty ignition system and is causing the detonation cause the timing is off.

you need to get it to a qualified service center that has state of the art diagnostic equipment.

What is the closest big city to where you libve in TX someone on the forum might direct you to a good place to go
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Old 01-05-2004, 04:47 PM   #4
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Quote:
Originally Posted by Brent
is it white smoke or dark smoke? White smoke you might be leaking oil into somewhere your not suppose to be.... somewhere in the left side of the block maybe?

Not an engine tech but just my .02
Blue Smoke - Burning Oil
Black Smoke - Rich Condition (Good Kind )
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Old 01-05-2004, 04:51 PM   #5
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No, what you want is stochiometric, neither rich or lean, but correct air fuel mixture, either too rich or too lean is bad.
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Old 01-05-2004, 08:24 PM   #6
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well your both, kinda, wrong.

Stoich A/F ratio is like 14.7 isnt it? Most tuners will tune a car for high 12s into the mid 13s for optimal performance A/F ratio.

So techinically, you want to be slightly rich, but not so much that you make black smoke. Grey smoke is good, white is very bad and black is a sign of being rich(can be bad sometimes)
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Old 01-05-2004, 08:53 PM   #7
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It is White smoke and I live in FLower MOund. It is in Denton and near Dallas. Thanks
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Old 01-05-2004, 09:12 PM   #8
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yikes

that sounds like a head gasket problem
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Old 01-05-2004, 09:27 PM   #9
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Quote:
Originally Posted by stangin99
well your both, kinda, wrong.

Stoich A/F ratio is like 14.7 isnt it? Most tuners will tune a car for high 12s into the mid 13s for optimal performance A/F ratio.

So techinically, you want to be slightly rich, but not so much that you make black smoke. Grey smoke is good, white is very bad and black is a sign of being rich(can be bad sometimes)
Did you see Trucks on Spike when he tuned that disel and when he launched it, it blew back smoke out like you wouldn't believe.
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Old 01-05-2004, 09:48 PM   #10
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deisel smoke is different from gasoline smoke
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Old 01-05-2004, 10:48 PM   #11
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I know that. My dad works around them. I've even been in the yard when a tractor came in and the supercharger blew up.

I brougt up another topic.
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Old 01-05-2004, 11:02 PM   #12
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yikes

that sounds like a head gasket problem
So am I in the ballpark stangin99?
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Old 01-05-2004, 11:10 PM   #13
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It could be a head problem but the knock is troublesome. Typically in a head gasket problem the car acts up more at idle and runs better under acceleration. This car is doing the opposite. Something more is going on !!!!!!
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Old 01-05-2004, 11:24 PM   #14
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Did you buy the car new? If you did see what the dealership has to say about it if the car is still under warrenty. Otherwise maybe you spun a bearing. But that wouldn't explain the smoke. My friends dad has a 1994 Thunderbird with the 3.8 and when you start the car in the morning and it idles up as normal, it gives this god awful knocking/rattling sound. When ur driving around and under acceleration, sometimes it does it, and sometimes it doesnt. I dont get it. Maybe you have the same problem.
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Old 01-06-2004, 03:05 AM   #15
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I'd yank off any modded parts on the intake and see if that fixes it.
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Old 01-06-2004, 11:47 AM   #16
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Originally Posted by Dom
I know that. My dad works around them. I've even been in the yard when a tractor came in and the supercharger blew up.

I brougt up another topic.

they use superchargers? I always thought they used huge *** turbos...hmm


Brent, could be. I haven't had the luxury of having a head gasket problem yet (I just destroy my heads ) so Im not 100% sure how white the exhaust smoke has to be to indicate a head gasket problem.

Your best bet is to start testing the engine. Look for anything metal that might be bouncing on the engine bay walls, my CAI bounces on my strut tower and makes a thump.

Do a compression test, look at your oil/coolant for starters.
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Old 01-06-2004, 12:00 PM   #17
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People often confuse white smoke with steam when you blow a head gasket water vapor comes out most of the time
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Old 01-06-2004, 01:03 PM   #18
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Quote:
Originally Posted by Danger Dude
People often confuse white smoke with steam when you blow a head gasket water vapor comes out most of the time
The last time I blew a head gasket... the Gasket blew between cly 4 and 5, then out the side of the gasket to the outside (BTW, this was on my 66 I6 Stang). But I didnt have ANY abnormal exhaust colors.
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Old 01-06-2004, 01:09 PM   #19
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You are right a small blow between just 2 cylinders will put out minimal vapor. I had a nissan Stanza that when the headgasket blew it look like a steam engine letting off presure. It happened in traffic and as I looked behind in the rear view all the cars behind me dissappeared in a misty cloud. It took a while to get home The car was using about 2 gals of water a mile hehehhehhehe
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Old 01-06-2004, 01:30 PM   #20
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Maximum power occurs with a slightly lean mixture. Tuners tune for a bit richer than optimal to prevent failure of the engine. If you go too lean the engine starts to burn itself, essentially, causeing the engine to failure, usually a piston. Keeping it richer than optimal ensures enough fuel to prevent this failure.

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Holy crap he's right.
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Old 01-08-2004, 04:59 PM   #21
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wasnt this post in maint and general tech?
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Old 01-08-2004, 05:15 PM   #22
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Quote:
Originally Posted by Dom
Quote:
Originally Posted by Brent
is it white smoke or dark smoke? White smoke you might be leaking oil into somewhere your not suppose to be.... somewhere in the left side of the block maybe?

Not an engine tech but just my .02
Blue Smoke - Burning Oil
Black Smoke - Rich Condition (Good Kind )
Exactly! And white smoke could mean coolant entering your combustion chamber... definitely not a good thing!
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Old 01-08-2004, 05:33 PM   #23
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Re: Nobody can fix it...please help!!!

Quote:
Originally Posted by BluStang6
Ok i have been to three different shops and nobody can fix my car. I have a 00 auto v6 with straight back duals and the denscharger ful length intake. After the car is warmed up it makes this knocking sound when I accelerate. It is not detonation but has suomthig to do with carbon build up. One place replaced the EGR valve (whatever that is) and it was fixed for about 3 days but then came back. Also when I start the car smoke comes out the left tailpipe and it stinks. If anybody knows what the hell is wrong with my car any help would be appreciated. Thanks!
Did this begin to happen before or after the intake and exhaust mods? How is your gas mileage? If it went away for a while after your egr was change then it most likely has something to do with your breathing system. But first go to the basics. Perform a cylinder cutout test and/or check each of your sparkplugs. Also if you have changed your spark plugs you might have forgotten to GAP THEM TO THE PROPER SPEC. If your egr valve fixed the problem temporarily that means that it was clogged from excessive carbon buildup and it has happened again. Something is causing your engine to buildup carbon. Also check your air filter and make sure there is no leaks in your intake system that would cause unfiltered air to enter you engine. That's all I could think of right now but I really have a feeling that your spark plugs could be the problem.
A fouled sparkplug could be causing that bad smell.
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Old 01-08-2004, 07:43 PM   #24
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Quote:
Originally Posted by 232SCstang
Did you buy the car new? If you did see what the dealership has to say about it if the car is still under warrenty. Otherwise maybe you spun a bearing. But that wouldn't explain the smoke. My friends dad has a 1994 Thunderbird with the 3.8 and when you start the car in the morning and it idles up as normal, it gives this god awful knocking/rattling sound. When ur driving around and under acceleration, sometimes it does it, and sometimes it doesnt. I dont get it. Maybe you have the same problem.
this could actually be your problem...

back a while ago when i had to replace my engine a rod bearing broke somehow and made a rattling/scraping sound whenever id go over about 2200 rpms. Turned out in the end i had to replace the whole block cause a rod went right through it. Get that thing checked out asap! also this all happened cause of those wonderful head gaskets that ford is notorious for. I also had white smoke (steam actually) too so id be very quick in getting that checked out! dont drive the thing anymore it still has hope
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Old 01-09-2004, 08:51 AM   #25
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your best bet might just be to take it to Ford.
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Old 01-10-2004, 10:15 AM   #26
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your best bet might just be to take it to Ford.
yeah!
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