International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > Fuel Injection

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 09-02-2019, 09:49 AM
unclbuk unclbuk is offline
230 Tornado
 
Join Date: Jun 30, 2019
Location: Cincinnati, OH
Posts: 4
FITech Street 400 Hard Starting

Has anyone installed a FITech Street 400 system on a stock AMC 360 V8? Mine was recently installed by a shop with a good reputation. I am able to start it when cold, but once warmed up, it is really hard to start. Cranks over and almost catches, but won't fire up.

My Prime Fuel Mult is set at 259.
Crank Fuel 20F is set at 0.8
Crank Fuel 65F is set at -21.1
Crank Fuel 170F is set at -40.6

Has anyone had success with different settings on a stock 360?
Reply With Quote
  #2  
Old 09-11-2019, 09:46 AM
unclbuk unclbuk is offline
230 Tornado
 
Join Date: Jun 30, 2019
Location: Cincinnati, OH
Posts: 4
Wow - 60 views and no responses...guess I'll keep tinkering with the settings.
Reply With Quote
  #3  
Old 09-12-2019, 06:18 PM
acct21's Avatar
acct21 acct21 is offline
327 Rambler
 
Join Date: May 20, 2014
Location: Austin, TX
Posts: 719
Sorry -- this forum is getting less and less traffic by the day. Sad result of the "instant satisfaction" people get from posting on social media forums. Only problem with that is there is no way to archive -- or really search -- for the information. So the same questions get asked over and over.

Not much experience here on the forum with the Fitech from what I've seen through the years -- mainly guys with GM TBI, Howell, and Holley.

Problems with warm starts may be timing related. What is your base timing?
__________________
1990 Grand Wagoneer with HD towing package -- everything works! (for now...)
Reply With Quote
  #4  
Old 09-16-2019, 07:37 AM
unclbuk unclbuk is offline
230 Tornado
 
Join Date: Jun 30, 2019
Location: Cincinnati, OH
Posts: 4
Well, thanks for the reply! Interesting observation on the reason for less traffic on the forum. I don't use social media, so I'll have to keep resorting to other ways to learn!


My mechanic said Fitech is owned by Holley, but I have no way to confirm that.


Anyway, we've tinkered with the settings and the car is getting easier to start.
Reply With Quote
  #5  
Old 09-16-2019, 09:52 AM
UnkleMunky's Avatar
UnkleMunky UnkleMunky is offline
350 Buick
 
Join Date: Oct 17, 2000
Location: The Zenith City, Up Nort'
Posts: 1,209
I think the mention that there was limited experience with FiTech on here is spot on. I have no knowledge about their products really, so couldn't be of any help to you directly. And gather many others are in the same boat.

Have you tried contacting the company directly? It looks like this is their website:

https://fitechefi.com/

Other than continuing to tinker as you are, and probably searching elsewhere online for suggestions, that is probably going to be your best help. Feel free to post back when you get things working better as it could help others down the line.

What do you think of the system otherwise? They seem to have a lot of options on their site and I couldn't see an easy way to narrow down choices to what might be needed for a FSJ. Why did you go with the Street 400 over any of their other options?
__________________
Michael (UnkleMunky)
'78 J10: 258, 4 speed(T18), longbed, topper
'08 Dodge Grand Caravan
Some dogs, a few fountain pens...and too many sewing machines...
Reply With Quote
  #6  
Old 09-16-2019, 09:33 PM
Full Size Jeeper's Avatar
Full Size Jeeper Full Size Jeeper is offline
304 AMC
 
Join Date: Jul 20, 2014
Location: Mandeville Louisiana
Posts: 1,843
No harm in asking here, but you will have better luck at Fitech forums. I have the Holley Sniper and have used Holley Sniper forums. Good luck.
__________________
1978 Wagoneer

401/turbo 400 trans. Quadra-Trac BW1339 (with Low) 4" Rusty's lift with 31" Summit Mud Dawgs

Mods:
Fuel Tank, Red Holley Fuel Pump, Razor Grill (profile pic out dated), Rebuilt steering box
Reply With Quote
  #7  
Old 10-20-2019, 08:20 PM
R69US's Avatar
R69US R69US is offline
232 I6
 
Join Date: Apr 06, 2015
Location: San Diego
Posts: 61
Quote:
Originally Posted by unclbuk
Has anyone installed a FITech Street 400 system on a stock AMC 360 V8? Mine was recently installed by a shop with a good reputation. I am able to start it when cold, but once warmed up, it is really hard to start. Cranks over and almost catches, but won't fire up.

My Prime Fuel Mult is set at 259.
Crank Fuel 20F is set at 0.8
Crank Fuel 65F is set at -21.1
Crank Fuel 170F is set at -40.6

Has anyone had success with different settings on a stock 360?

I'm running FiTech on my SBC 350...shouldn't be all that different. Those crank fuel numbers seem way off...I have mine all around 0. The multipliers are adjusted off of a zero 'base' number, and yours seem pretty far off, telling me it's not maybe not getting enough cranking fuel.
-A couple of things...does the screen stay lit while cranking? If not, you may have the white wire to the FiTech losing power during crank (common mistake during install that I also made, makes it tough to start).
-Depending on when you got yours, the temp sensors that came with the unit read pretty low...if you're handheld is reading less than I think 170 or so it won't get into the learn mode. The correct sensor is ACDelco 213-928.
This cleaned up a lot of issues on mine, including an annoying off-idle stumble that I was previously unable to get rid of.

You should definitely hop over to the fitech tuning forum. Lots of good info there.

But to re-cap:
-Verify timing
-Make sure the unit isn't dropping power during crank
-Make sure you have the correct temp sensor
Reply With Quote
  #8  
Old 10-20-2019, 08:25 PM
R69US's Avatar
R69US R69US is offline
232 I6
 
Join Date: Apr 06, 2015
Location: San Diego
Posts: 61
As I read your initial post again, I'd say definitely look at that white wire source power. What I (and lots of others) did wrong was tie that into a keyed ignition source that drops voltage when the key moves to "crank" position. It tends to start cold because the system gets a good prime when it's cold, will catch and start, then once you're no longer cranking it the voltage comes back and it stays running.
Reply With Quote
  #9  
Old 10-21-2019, 11:31 PM
Crankyolman's Avatar
Crankyolman Crankyolman is offline
258 I6
 
Join Date: Sep 27, 2017
Location: Pacific Northwest
Posts: 371
Quote:
Originally Posted by R69US
I'm running FiTech on my SBC 350...shouldn't be all that different.


You might think that but in reality they are significantly different engines. Fitech designed their system around the small block Chevy so those settings wound have been designed to essentially be set at 0 for that engine but requires a lot of tinkering to get it dialed in on a different engine.
__________________
'72 J4500
Reply With Quote
  #10  
Old 10-21-2019, 11:45 PM
Crankyolman's Avatar
Crankyolman Crankyolman is offline
258 I6
 
Join Date: Sep 27, 2017
Location: Pacific Northwest
Posts: 371
unclbuk, I finally got my truck back and just went out and checked the settings I have.


My settings are


Prime fuel multi is -20
Crank Fuel 20F is set at 97.7
Crank Fuel 65F is set at 97.7
Crank Fuel 170F is set at 68.8


I think what I did was start at the factory settings then adjust the crank fuel up and down which made little difference so I began turning the prime fuel multi off completely then began turning the others up until I saw improvement. eventually I had the crank fuels maxed out so I then began dialing the prime fuel multi back up until I got the best results for cold and hot starts alike.



I will say it still doesn't start as quickly as it did with half a pump with the carb but it is much better than it did with the factory settings.


It might be worth noting that I live where summer mornings are usually in the 50s or 60s and winter seldom gets below 20f and when it gets below 35f I have an oil pan heater to keep my oil warm.
__________________
'72 J4500
Reply With Quote
  #11  
Old 11-29-2019, 09:24 AM
Tommy854runner Tommy854runner is offline
230 Tornado
 
Join Date: May 10, 2019
Location: Alpharetta
Posts: 5
Haven't logged on in a while but should have a long time ago! I have the 4 barrell FI tech with a edelbrock intake manifold but otherwise stock engine. I had the same exact problem on mine. After it warmed up it wouldn't restart until it cooled back down to around 150 degrees. We attributed it to the fuel pump I used was for a throttle body s10 and swapped to a walboro for a Camaro ss. It starts hot now but does have a little hesitation and sometimes will stall but fire right back up. It does have what feels like a miss at idle too which is super annoying. I might play with my fuel ratios and see what happens. I just put it in self learn mode and rolled with it. It runs fantastic under load though!
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
J20 Hard starting when warm J20Hunter General FSJ Tech 5 02-29-2016 08:07 PM
Hard starting when cold - new electric choke needed? 87 Money Pit General FSJ Tech 2 05-14-2011 06:24 PM
Hard starting hot... homebru420 General FSJ Tech 9 08-19-2001 03:26 PM
hard starting when hot... 72wag General FSJ Tech 0 02-19-2001 09:23 AM


All times are GMT -6. The time now is 10:13 PM.


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
corner corner