Welcome, Guest. Please login or register.
July 22, 2018, 06:24:55 pm

Login with username, password and session length
TRADER Feedback System
IS NOW AVAILABLE
* SBFTECH Membership Required *
435248 Posts in 37264 Topics by 9537 Members
Latest Member: Mgabski
Search: Advanced search
Advertiser Inquiries
+ My Community
|-+ General Tech
| |-+ Joel 5.0's Electronic Engine Management
| | |-+ 1993 Cobra... Popping/misfiring intermittently
0 Members and 1 Guest are viewing this topic. « previous next »
Pages: 1 2 [3] Go Down Print
Author Topic: 1993 Cobra... Popping/misfiring intermittently  (Read 28570 times)
kilby91
Small Block
***
Offline Offline

Posts: 191


Location: Jackson, MS

« Reply #30 on: November 06, 2015, 10:25:18 am »

Is there any reason that the stock computer without a "tune" would cause an issue like mine? I have several people telling me that I should get a chip and a tune before I chase this problem anymore, "because a 347 wont ever run ideal on a stock computer and tune"... Any truth to this?? I haven't ever had the need to get a tune before..

Thanks,

Richard
Logged
mighty mouse
"Prom King Mista Nathan Moonen"
Administrator
Big Block
*****
Offline Offline

Posts: 12781


Location: Decorah, Iowa
I'll be the Judge of that


« Reply #31 on: November 06, 2015, 10:03:12 pm »

Untrue. While it may not have an optimum fuel and timing curve, the stock tune/ecm would not cause low speed idle/running issues.
Logged

1986 Mustang GT Convertible
Suspension and Differential by Team Z Motorsports
9.5 Deck Forged Stroker Shortblock by FordStrokers
Trick Flow High Ports and Super Vic EFI intake by Duane Busch

I'd rather be a fool who is loyal to his friends than a POS that jumps ship to save face. We were wrong in the end, but nobody can ever call us disloyal. I can live with that.
Joel5.0
El Hombre
Administrator
Big Block
*****
Offline Offline

Posts: 22510


Location: Puerto Rico
Miracles?.... by appointment only!


« Reply #32 on: November 09, 2015, 06:49:39 am »

What He Said...... any issues regarding A/F control (for example) would show up as lean/rich failure codes in the ECM. Another item I suggest you check and monitor real time, is fuel pressure. LUK
Logged

ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
Chickenbone
Small Block
***
Offline Offline

Posts: 109

Location: Joisey

« Reply #33 on: November 09, 2015, 12:47:33 pm »

When you replaced the spark plugs, how did they look?  I know this was over 2 mos ago, but I am curious. 

My Crown Vic (mostly stock) has the same problem.  The pickup (where the TFI module plugs into) in the dizzy died and stranded the car in the driveway.  Replaced the dizzy and the car ran fine for a couple days until it developed a low rpm and at idle miss.  I changed the wires and plugs and it improved a little, but still has a little bit of a miss.  It's much worse on damp days.  The rear plug on the driver's side is a little fouled, but not enough (I think, because I have seen worse) to cause a miss.

I know I have a vacuum issue as well.  That occurred after I pulled the dash to replace the heater core; the car has a huge stumble at low RPMs.  Discovered there is a vacuum distribution block behind the engine where I can't get to (even with my Cruella hands).

I will be swapping engines, but would like to see what the problem is before doing so.  Sorry for the partial thread-jack 

Chickenbone   
Logged
kilby91
Small Block
***
Offline Offline

Posts: 191


Location: Jackson, MS

« Reply #34 on: February 15, 2017, 12:04:10 pm »

Just as a follow up to this thread I started a couple years ago... The car still has the damn miss and I don't think I am ever going to fix it... Runs great, just not at WOT.. Replacing coil tonight, because its the only thing I haven't tried in the ignition system that I can think of.
Logged
kilby91
Small Block
***
Offline Offline

Posts: 191


Location: Jackson, MS

« Reply #35 on: February 20, 2017, 02:27:06 pm »

Car has been sitting a lot over the past year or so, so I re did the base idle, got a new IAC valve, re set timing to 14*, etc..

Re ran the diagnostic codes yesterday:

KOER - 94, 44, 33
KOEO - 81,82,84,85

Cyl. Bal. Test - 9


So no unusual codes, but miss still remains. I am officially stumped...

Logged
kilby91
Small Block
***
Offline Offline

Posts: 191


Location: Jackson, MS

« Reply #36 on: February 27, 2017, 03:48:56 pm »

Well, its fixed... Runs great now, and has for the last week or so....

Not really sure what fixed it though.. I put a new ignition coil on it, ran a large ground wire from battery ground to the block, re-plumbed some of the factory vacuum lines in engine bay, replaced IAC valve, re-set timing and did base idle reset a few times to get it right..

Car runs better than it ever has since I have owned it in 3-1/2 years...


 WTF       
Logged
flasch192
4 Banger
*
Offline Offline

Posts: 33

Location: Fond Du Lac WI

« Reply #37 on: March 01, 2017, 04:53:48 pm »

cool thanks for letting us know the outcome !!
Logged
kilby91
Small Block
***
Offline Offline

Posts: 191


Location: Jackson, MS

« Reply #38 on: March 01, 2017, 07:13:04 pm »

I cant stand when somebody doesnt follow up in a thread like this when/if they get it figured out.. Believe me, ive read a lot of them trying to figure this car out.. Even though my solution is still kind of unknown, something i did fixed it. And i listed it all here...
Logged
RunninHorse
Big Block
*****
Offline Offline

Posts: 3353


Location: Floresville, Texas
Órale!


« Reply #39 on: March 01, 2017, 10:30:06 pm »

Sweet, glad you got it sorted out.
Logged

I'm Rob.  Working on my '93 Reef Blue coupe.  Stock internal 302, 80 MAF, 75 TB, Victor 5.0, High Ports, 30# inj., B303, 1.6s, Tremec TKO 3550, Quicktime bell, Fidanza Al flywheel, stage 3 ceramic clutch, & 4.10s.  12.68 @ 111.69
'66 F100 shortbed, 352ci, 3 on the tree - on hold
'65 Coupe rolling chassis - on hold
Parts I'm selling: 
Hardened Push Rods - Trick Flow 6.2" .080 - $60
Misc. Fox Body Interior Pieces
289nate
"IL BUONO"
Global Moderator
Big Block
*****
Offline Offline

Posts: 11467


Location: Los Angeles

« Reply #40 on: March 03, 2017, 06:47:43 pm »

 
Well, its fixed... Runs great now, and has for the last week or so....

Not really sure what fixed it though.. I put a new ignition coil on it, ran a large ground wire from battery ground to the block, re-plumbed some of the factory vacuum lines in engine bay, replaced IAC valve, re-set timing and did base idle reset a few times to get it right..

Car runs better than it ever has since I have owned it in 3-1/2 years...


 WTF       

IAC, has caused a problem for me on two cars but each were 5.4L mod motors.  Issue wasn't at WOT.  I'd also be surprised if it was a vacuum leak though I'm just a carburetor tuning garage goofball hack.  I would sort of rule those out.  I'm just glad you have it FIXED!!!
Logged

\'65 fastback pump gas 289, 4.56 gears, and faceplated T5.  11.123 at 122.4
Pages: 1 2 [3] Go Up Print 
« previous next »
Jump to:  



Powered by MySQL Powered by PHP Valid XHTML 1.0! Valid CSS!
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines



408 Stroker