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Re: Having issues with my EZ EFI (still)
[Re: Slipknot440]
#1080211
10/13/11 04:38 PM
10/13/11 04:38 PM
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Joined: Jan 2008
Posts: 299
East Brunswick, NJ
finadk
enthusiast
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enthusiast
Joined: Jan 2008
Posts: 299
East Brunswick, NJ
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What is the battery voltage with the car off? When the car is running at idle? and then with the wipers, headlights, and blower on. If it is not 13.5 or above under all those vconditions you are gonig to have problems.
Honestly it sounds like you have charging, battery, alternator problems that are completly unrelated to the EFI. If they were so bad that you had to replace the harness you have major problems that need to be addressed. It will never run until you sort out your electrical problems. Im surprised that any reputable shop would take your money to install the EZ EFI if the charging system problem was that bad.
Scott
1956 Dodge Custom Royal Lancer (408 Stroker, 4 Wheel Disc Brakes, Rack & Pinion, 6 speed)
2002 Dodge Ram 1500 Quad Cab
1976 Corvette
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Re: Having issues with my EZ EFI (still)
[Re: Slipknot440]
#1080212
10/13/11 04:41 PM
10/13/11 04:41 PM
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Joined: Oct 2011
Posts: 2
St. Louis
nihil
member
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member
Joined: Oct 2011
Posts: 2
St. Louis
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Have you checked your alternator output? I could see it crapping out at lower RPM due to lack of power for the fuel pump and ignition. Might be worth using another car and breaking out the jumper cables to see if it will run at low rpm/proper idle with a known healthy electrical system behind it.
`68 Charger R/T
`02 A4 1.8TQMS
`97 Jeep TJ
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Re: Having issues with my EZ EFI (still)
[Re: Slipknot440]
#1080216
10/13/11 08:22 PM
10/13/11 08:22 PM
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Joined: Jan 2003
Posts: 16,810
Between Houston & Galveston TX
SattyNoCar
Smarter than no class Flappergass by a mile
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Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,810
Between Houston & Galveston TX
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No personal experience with EZ efi, but, I can't help but wonder if it is related to the charging system/wiring. Reason for thinking that, I've personally seen several late '90's TRUCKS where the alternator was fine, but the battery was weak/dead (jumped off) and the truck would NOT idle. Even if the truck did manage to start on its own, it would not idle. A fresh battery and the idle came back. 
John
The dream is dead, long live the dream.......😥
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Re: Having issues with my EZ EFI (still)
[Re: SattyNoCar]
#1080217
10/13/11 09:44 PM
10/13/11 09:44 PM
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Joined: Oct 2010
Posts: 183
Eden, Texas
Strawdawg
member
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member
Joined: Oct 2010
Posts: 183
Eden, Texas
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if it reads 11.7 with the engine off, then you know you have a bad battery, or a bad case of wiring, or a bad alternator, or...all of the above....
Steve
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Re: Having issues with my EZ EFI (still)
[Re: Slipknot440]
#1080219
10/13/11 10:15 PM
10/13/11 10:15 PM
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Joined: Mar 2004
Posts: 375
Canada
DmanSRT71
enthusiast
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enthusiast
Joined: Mar 2004
Posts: 375
Canada
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No way, get it fixed before you even consider putting it away. 13.5 with the engine running is good. 11.7 with it off is bad. do you have a slow drain with the key off? Always having a dead battery by the time you want to start. Quote:
i took the battery back to the auto store and they said it's putting out enough volts that they won't replace it. I can always take the gold series out of my jeep and see if it does better. I'll see tomorrow and hopefully things will get better since it's almost time to pack the car up for the winter
69 Road Runner 383/auto/N96
71 Demon 340/4 spd
Would like to find a rust free Cuda body.
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Re: Having issues with my EZ EFI (still)
[Re: Slipknot440]
#1080221
10/13/11 10:53 PM
10/13/11 10:53 PM
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Joined: Oct 2010
Posts: 183
Eden, Texas
Strawdawg
member
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member
Joined: Oct 2010
Posts: 183
Eden, Texas
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Hope they load tested the battery properly...but, it should read over 12 with the key on, engine off...so, if the battery is truly ok, then you have wiring problems...
Steve
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Re: Having issues with my EZ EFI (still)
[Re: SattyNoCar]
#1080222
10/14/11 09:18 AM
10/14/11 09:18 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
No personal experience with EZ efi, but, I can't help but wonder if it is related to the charging system/wiring.
Reason for thinking that, I've personally seen several late '90's TRUCKS where the alternator was fine, but the battery was weak/dead (jumped off) and the truck would NOT idle. Even if the truck did manage to start on its own, it would not idle. A fresh battery and the idle came back.
yep, when I had a cell go bad in my old '96 ram's battery, I could jump it and start it, but it would not idle.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Having issues with my EZ EFI (still)
[Re: Slipknot440]
#1080223
10/14/11 09:19 AM
10/14/11 09:19 AM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Quote:
i've run the battery down to dead a few times before I got the wiring redone. And unfortunatly the auto parts store's little machine says it checks out and won't replace it
Slipknot -
I had a similar situation a few years ago with a battery from Autozone. It drained heavily a few times when it was new (I had a relay coil that was wired to be battery hot - OOPS!) and I kept recharging and using it. I fixed the relay issue but my battery trouble continued -- every few weeks, teh battery was dead.  (I have a mini-starter so teh car always starts pretty easy even on low voltage).
Had the battery checked by the store a few times, it was always said to be OK. I had them check my alternator, I replaced some suspicious wiring connections, always had battery trouble every few weeks. Put new VR and alt on. Still had trouble. They pointed to teh car repeatedly because it surely couldn't be their battery, 'they hardly ever have them come back'. 
Finally -
I charged teh battery fully, wiped all teh dust off of it to prevent old-wives-voltage leakage, and placed it on cardboard on my workbench. It went down below 12v within a week. Went to a different parts store chain, gave them that POS battery as a core, got a new one, and my problems went away. 
Now, with all that said...
You've got 13+ volts at 1400+rpm. Even a bad battery is going to hold onto some of that and ramp down after you close the throttle, it's not going to plummet to 11.7 immediately. But the engine dies immediately. If the EZ-EFI is that sensitive to voltage fluctuation then it's a poorly-designed system (I suspect that's not the case, though). EFI designers know that they need to install voltage vs pulsewidth curves for the injectors to allow an engine to keep running for a while if the charging system fails (and also due to voltage fluctuation due to electical loads). I don't see this as your specific problem.
Can you set the idle speed up to 1400 with an adjuster screw? Get it running while holding the throttle, adjust hte screw up to that speed, then back it off slowly and see what happens.
It sounds to me like you have a fuel delivery problem. If it is due to voltage drop, then the injector PW is set so far on the lean side that the reduced voltage cuts the fuel too far. (which would mean 2 problems, really).
But yes, the easiest thing is to swap in a known-good battery for a 15-min experiment.
Last edited by Fury Fan; 10/14/11 09:53 AM.
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Re: Having issues with my EZ EFI (still)
[Re: Slipknot440]
#1080224
10/14/11 10:05 AM
10/14/11 10:05 AM
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Joined: Jun 2008
Posts: 1,822
Colorado
denfireguy
top fuel
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top fuel
Joined: Jun 2008
Posts: 1,822
Colorado
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Quote:
i've run the battery down to dead a few times before I got the wiring redone. And unfortunatly the auto parts store's little machine says it checks out and won't replace it
The parts store tester and/or the operator there is wrong. Your battery has a bad cell. If you have another location for the chain in your area, go there and try again. If they will not replace it go somewhere else and buy a battery. The brain damage from chasing this problem is not worth the money!
Something that is often overlooked in ignition noise trouble shooting is that the battery acts as a very large filter capacitor. It takes care of the ripple on the output of the alternator diodes, some of the hash from the coil primary from firing and other voltage spikes from switches turning on and off. A bad battery will not filter this noise out.
Craig
2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado
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Re: Having issues with my EZ EFI (still)
[Re: Fury Fan]
#1080225
10/14/11 10:28 AM
10/14/11 10:28 AM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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For the late 90s Rams –
That’s an EFI system that controls spark (EZ doesn’t), probably has a PWM fuel pump and returnless fuel system, and the ECM controls the alternator. As XCraig mentioned, the battery acts as a voltage spike buffer, so I can see how a bad battery might sometimes cause an idling issue, as the ECM is trying to control fuelpump and injector control, Vreg, Idle Air Control, and spark timing on noisy voltage. That’s a more complicated animal than EZ.
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Re: Having issues with my EZ EFI (still)
[Re: Slipknot440]
#1080227
10/15/11 06:23 PM
10/15/11 06:23 PM
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Joined: Oct 2010
Posts: 183
Eden, Texas
Strawdawg
member
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member
Joined: Oct 2010
Posts: 183
Eden, Texas
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Take the pre-pump screen out of the pump and examine it with a magnifying glass to make sure it is not full of microscopic trash...don't think your eyesm alone are good enuf to see it...
You should have 43 psi and the pump will start to make more noise and the pressure will be low if the screen is plugged up.
Steve
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