Misfire on Cylinders 5, 7, 8 (FIXED! Broken Valve Spring) - Page 6 - TriStateTuners.com :: Home of Tristate Auto Enthusiast

PAFirefighter11 · 04-20-2013, 11:28 AM

I've basically given up on the '98 for the time being. Anyone who wants to come check it out is welcome... I'm at a loss. Going to do the head gaskets on the '01 and probably sell that one. Need to thin the heard. Purchased a house.

Honduh · 04-23-2013, 03:46 PM

Did you ever do a exhaust back pressure test?

PAFirefighter11 · 04-24-2013, 05:15 PM

Negative.

Steve-Oh · 04-24-2013, 08:11 PM

Lol what a waste of space! Sell both those black turds and buy a Mustang already!

AutobahnRacer · 04-25-2013, 12:13 PM

Let me Answer this for him.

Quote:

Originally Posted by PAFirefighter11

Quote:

Originally Posted by Steve-Oh

Lol what a waste of space! Sell both those black turds and buy a Mustang already!

Quote:

Originally Posted by PAFirefighter11

Negative.

Steve-Oh · 04-25-2013, 01:29 PM

Quote:

Originally Posted by AutobahnRacer

Let me Answer this for him.

I dunno man, he really liked that 2013 he was driving! Probably faster then his TA.

AutobahnRacer · 04-25-2013, 05:14 PM

Quote:

Originally Posted by Steve-Oh

I dunno man, he really liked that 2013 he was driving! Probably faster then his TA.

Not sure I'd want either lol. Sure both are fast, but build quality neither are fantastic.

As for the misfire, I am in the same damn boat. I have replaced just about every conceivable part that would cause a misfire and am not any closer to a solution.

PAFirefighter11 · 04-25-2013, 05:15 PM

My Dad's 2013 Mustang V6 Auto:
RWHP: 260
1/4 mile: 13.9
MPG: 31 Highway

2013 5.0L Mustang GT - Manual:
RWHP: 363
1/4 mile: 12.7
MPG: 26 Highway

My '98 Trans Am - 6 speed:
RWHP: 320
1/4 mile: 12.7 (If the damn thing ran properly)
MPG: 29 Highway

I just want it back on the road! 13.1 MPG overall in my 5.9L ZJ is killing me. I drive 50+ miles round trip a day. I'm honestly about to buy a Civic VX, HX or CRX HF. FML....

Steve-Oh · 04-25-2013, 06:50 PM

Quote:

Originally Posted by PAFirefighter11

My Dad's 2013 Mustang V6 Auto:
RWHP: 260
1/4 mile: 13.9
MPG: 31 Highway

2013 5.0L Mustang GT - Manual:
RWHP: 363
1/4 mile: 12.7
MPG: 26 Highway

My '98 Trans Am - 6 speed:
RWHP: 320
1/4 mile: 12.7 (If the damn thing ran properly)
MPG: 29 Highway

I just want it back on the road! 13.1 MPG overall in my 5.9L ZJ is killing me. I drive 50+ miles round trip a day. I'm honestly about to buy a Civic VX, HX or CRX HF. FML....

Don't worry man, we'll get you fixed up! Let me know about Sunday.

Sent from Space

PAFirefighter11 · 04-26-2013, 11:24 AM

Quote:

Originally Posted by Steve-Oh

Don't worry man, we'll get you fixed up! Let me know about Sunday.

Sent from Space

Man I hope so. I figure if anyone can fix it up it'd be you, Phil and Chris! BTW: Forgot you had a TST account haha. You going to post Cobra photos once it's on the road?

Steve-Oh · 04-26-2013, 03:12 PM

Quote:

Originally Posted by PAFirefighter11

Man I hope so. I figure if anyone can fix it up it'd be you, Phil and Chris! BTW: Forgot you had a TST account haha. You going to post Cobra photos once it's on the road?

We'll def try our best! Forgot? lol I just signed up. I will eventually once it's finished. Just looks like a disheveled mess right now. http://i272.photobucket.com/albums/j...psd8944af6.jpg

AutobahnRacer · 04-26-2013, 03:49 PM

I have three things left to do and not sure if anyone else said it because I am too lazy to go back and read if anyone else suggested it to you. Clean EGR and EGR ports, check injectors (myself) and check coil.

PAFirefighter11 · 05-01-2013, 02:13 PM

Quote:

Originally Posted by Steve-Oh

We'll def try our best! Forgot? lol I just signed up. I will eventually once it's finished. Just looks like a disheveled mess right now. http://i272.photobucket.com/albums/j...psd8944af6.jpg

Ooooh, snap.. that would be why hahaha... Word, looks like a mess, but a lot of power in that mess!

Quote:

Originally Posted by AutobahnRacer

I have three things left to do and not sure if anyone else said it because I am too lazy to go back and read if anyone else suggested it to you. Clean EGR and EGR ports, check injectors (myself) and check coil.

I added a brand new EGR valve and some lines, as well as in-line filters for oil trappage. Nothing changed. Injectors are all fine. Coils are all fine.

AutobahnRacer · 05-02-2013, 12:02 PM

Quote:

Originally Posted by PAFirefighter11

Ooooh, snap.. that would be why hahaha... Word, looks like a mess, but a lot of power in that mess!

I added a brand new EGR valve and some lines, as well as in-line filters for oil trappage. Nothing changed. Injectors are all fine. Coils are all fine.

I mean actual ports. My car has these, which are notorious for clogging.

inteva6184 · 05-04-2013, 10:39 AM

Mention of cobra steve chris and phil all in one thread wow its like the days of old. Chris and Phil are crazy buggers im sure they will figure it out or atleast have some crazy engine to replace it with haha

Steve-Oh · 05-04-2013, 12:25 PM

Quote:

Originally Posted by AutobahnRacer

I mean actual ports. My car has these, which are notorious for clogging.

Interesting. We can def check this out Rick.

Quote:

Originally Posted by inteva6184

Mention of cobra steve chris and phil all in one thread wow its like the days of old. Chris and Phil are crazy buggers im sure they will figure it out or atleast have some crazy engine to replace it with haha

I know really?! We've all come out of the woodwork.

PAFirefighter11 · 05-05-2013, 07:52 PM

Someone else who knows Phil, Chris and Cobra Steve? Impossibru! lol.

Updates...

Brought it to a buddy on Saturday. He is a master tech. Anyway, we used his MAF (He has a '98 TA as well, and a 3rd Gen) and it didn't change how the car runs. So he checked fuel pressure on his '98 TA is at 60 psi while running, drops to 50 when turned off, and stays there for hours upon hours. Mine is at 50 psi, then drops immediately to 0 when I turn off the car.

Today we tested the fuel pump draw and flow. Amps are around 7.5, which is just about where his '98 is (7.7). Also, volume of fuel is a bit more than his is flowing, so the fuel pump isn't the main issue. Changed the fuel filter, no change in drive-ability.

Checked vacuum. -15 or so at idle, and bouncing all over the place. Goes up to around 15-20 when on the gas, but again it's bouncing and not consistent. Per his tech book it's stating this could be a burnt valve, broken valve spring, etc. We're going to rip apart the top end this week.

inteva6184 · 05-06-2013, 08:42 PM

Not only do I know all of them but I drive an import so it doesnt really make sense at all haha. Anyway good luck.

Steve-Oh · 05-06-2013, 11:47 PM

Sent from Space

Honduh · 05-09-2013, 12:42 PM

i think i remember you saying you put a xpipe on? does that delete the cats?

04-24-2013, 08:11 PM	#104
Steve-Oh Tri-State Aficionado Join Date: Apr 2013 Member #25806 iTrader: (0)	Lol what a waste of space! Sell both those black turds and buy a Mustang already! __________________ Sig pic

05-04-2013, 10:39 AM	#115
inteva6184 Tri-State Addict Join Date: Jul 2009 Location: To far from japan Member #14151 My Ride: I am a ricer iTrader: (0)	Mention of cobra steve chris and phil all in one thread wow its like the days of old. Chris and Phil are crazy buggers im sure they will figure it out or atleast have some crazy engine to replace it with haha __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

05-06-2013, 08:42 PM	#118
inteva6184 Tri-State Addict Join Date: Jul 2009 Location: To far from japan Member #14151 My Ride: I am a ricer iTrader: (0)	Not only do I know all of them but I drive an import so it doesnt really make sense at all haha. Anyway good luck. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

05-06-2013, 11:47 PM	#119
Steve-Oh Tri-State Aficionado Join Date: Apr 2013 Member #25806 iTrader: (0)	Sent from Space __________________ Sig pic

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04-23-2013, 03:46 PM	#102
Honduh Tri-State Post Whore Join Date: May 2006 Member #1977 iTrader: (0)	Did you ever do a exhaust back pressure test?

04-26-2013, 03:49 PM	#112
AutobahnRacer Tri-State Post Whore Join Date: Jun 2006 Location: TriState, PA Member #2056 iTrader: (3)	I have three things left to do and not sure if anyone else said it because I am too lazy to go back and read if anyone else suggested it to you. Clean EGR and EGR ports, check injectors (myself) and check coil.

05-09-2013, 12:42 PM	#120
Honduh Tri-State Post Whore Join Date: May 2006 Member #1977 iTrader: (0)	i think i remember you saying you put a xpipe on? does that delete the cats?