Welcome, Guest. Please login or register.
September 22, 2018, 03:45:58 pm

Login with username, password and session length
435265 Posts in 37271 Topics by 9537 Members
Latest Member: Mgabski
Search: Advanced search
Advertiser Inquiries
+ My Community
|-+ General Tech
| |-+ Joel 5.0's Electronic Engine Management
| | |-+ Aftermarket Tuners - Generally
| | | |-+ surging while driving
0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] Go Down Print
Author Topic: surging while driving  (Read 4295 times)
90 stang vert
2stroke
*
Offline Offline

Posts: 4

Location: dover de

« on: October 16, 2012, 08:36:18 am »

i have a 90 mustang gt not running well, it has a surge while driving its a pretty big one. any ideas would be greatly appreciated.
Logged
Joel5.0
El Hombre
Administrator
Big Block
*****
Offline Offline

Posts: 22510


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


« Reply #1 on: October 16, 2012, 09:05:38 am »

 Welcome.... don't forget to add your location to your member profile..... Thanx!

Suggest to start with the basics:

1. Run a set of DIY KOEO/KOER self tests and post the results = http://sbftech.com/index.php/topic,2471.0.html

2. Verify overall intake tract sealing for vacuum leaks form the MAF to the lower intake and attached vacuum lines/hoses.

3. Measure and report back engine idle speed level and manifold vacuum reading.

4. Check what the spark plugs are "saying" = http://sbftech.com/index.php/topic,2735.0.html

5. Is this a stock setup or does it have any upgrades or bolt-on's installed? (intake, exhaust, heads, camshaft)

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
90 stang vert
2stroke
*
Offline Offline

Posts: 4

Location: dover de

« Reply #2 on: October 16, 2012, 09:28:26 am »

the car has some mods 306 with heads upper and lower intake, 520 cam, and exhaust.
Logged
Joel5.0
El Hombre
Administrator
Big Block
*****
Offline Offline

Posts: 22510


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


« Reply #3 on: October 16, 2012, 09:45:50 am »

520 cam ?
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
90 stang vert
2stroke
*
Offline Offline

Posts: 4

Location: dover de

« Reply #4 on: October 16, 2012, 09:51:56 am »

thats the size of the camshaft (lift).
Logged
90 stang vert
2stroke
*
Offline Offline

Posts: 4

Location: dover de

« Reply #5 on: October 19, 2012, 11:04:59 am »

Hi Joel,

i checked my spark plugs, pulled number 1 spark plug and it looked fine. i pulled one on back end and it was fouled up all black. i will change all plugs and see if there's a change. what should i gap the plugs to .35 or higher?
Logged
BirdMan
Adv_SBFTechie
Big Block
****
Offline Offline

Posts: 1923


Location: Topeka, KS

« Reply #6 on: October 30, 2012, 01:20:08 pm »

I don't know if this applies to injected engines but on a carbed one I had too much timing.  Dropped 2 degrees and it was okay.
Logged

Son's 412W Build Information;
http://sbftech.com/index.php/topic,19018.0.html
Son's '64 Falcon Performance Information;
http://sbftech.com/index.php/topic,25183.0.html
turbo2256
Big Block
*****
Offline Offline

Posts: 727

Location: KY, MICH, OH, IND, FLA

« Reply #7 on: October 30, 2012, 04:31:20 pm »

Does it still have EGR hooked up? If not you may have too much timing at low load conditions.
Logged
85_GT
Big Block
*****
Offline Offline

Posts: 1578

Location: NYC area

« Reply #8 on: October 30, 2012, 04:50:29 pm »

EGR spark is an adder based on EGR flow.
Logged

85GT, Dart Windsor Jr, Crane 2030 equiv. Performer 5.0, 75mm TB, 88mm Slot, 34lbs injectors, 1 5/8" shorties, 5spd converted to 4R70W with Baumann controller, 3.25 9"
A9L running A9P bin via Quarterhorse with LC-1
turbo2256
Big Block
*****
Offline Offline

Posts: 727

Location: KY, MICH, OH, IND, FLA

« Reply #9 on: October 31, 2012, 09:57:35 am »

One thing I remember is changing all the timing charts to resemble that of a mechanical distributor and data logging for info to change light load conditions.
So happy I went back to carbs on my build dont think about EFI any more all my tuning info is in 3 notebooks I will pass on to my son.
MY SBF builds take me past factory ECM RPM limits. Might go EFI again if I were to go with indivual TB aftermarket system.
Logged
Pages: [1] 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