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» Northern California Ford Owners     » Automotive   » Tech Talk   » 2000 Lightning - Shuts off when coming to stop

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Author Topic: 2000 Lightning - Shuts off when coming to stop
Rigo5.0
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Member # 5247

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Hello,
Having an issue with my Lightning...

Truck shuts off ONLY when coming to "hard stop". Turns right back on thereafter. It just started doing this a few weeks ago.

- Runs well, and no loss of power
- No issues with idle surging
- Added new IAC
- Cleaned mass-air
- No codes show up

Any thoughts on what it could be?

Thanks.

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91 5.0 [331|T56]
87 Grand National
02 Z06
09 CBR 600
08 SRT Challenger
13 Shelby GT500
00 Lightning

Posts: 1452 | From: Kansas City | Registered: Jan 2005  |  :
Martinna
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Member # 12493

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Does it stall as soon as you hit the brake or after the truck fully stops? Does initial speed make a difference?
Posts: 1045 | From: City | Registered: Oct 2012  |  :
Rigo5.0
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Stalls after if fully stops. No issues on initial speed, but did notice it turns off when coming to a hard stop.

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91 5.0 [331|T56]
87 Grand National
02 Z06
09 CBR 600
08 SRT Challenger
13 Shelby GT500
00 Lightning

Posts: 1452 | From: Kansas City | Registered: Jan 2005  |  :
Martinna
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Member # 12493

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From another website
quote:
Malfunctioning transmission: In a car with an automatic transmission, the torque converter takes the place of the manual clutch and is responsible for transmitting power. If the torque converter is broken, or if there is a low fluid level in the transmission, the converter will not do its job, and the car will be unable to maintain power at low speeds, which causes the engine to shut off. A defective TCS or torque converter solenoid can also cause this issue.

Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump: The fuel pump is responsible for transferring fuel from the tank to the engine. A malfunctioning fuel pump can result in low fuel pressure, which means that there is an inconsistent stream of fuel to the engine. At high speeds this doesn’t matter as much, but at low speeds a temporary pause in the fuel stream is enough to kill the engine. The fuel injectors are responsible for spraying a measured amount of fuel that is ignited by the spark plugs at the proper time. Injectors can become clogged or dirty over time resulting in erratic spray or no spray at all.

Bad oxygen sensor or mass flow sensor: The oxygen sensors and mass flow sensor determine how much oxygen is entering the fuel stream, and helps the vehicle adjust the air-to-fuel ratio. If there is too much or too little oxygen, your vehicle will not have optimal power. Just like with low fuel pressure, the car will continue to operate at driving speeds, but this suboptimal power won’t be able to fuel the vehicle as it slows down.

Loose or corroded wires in wiring harness: An inconsistently firing ignition will result in an easily stalled engine. If the wires don’t have consistent, constant, and reliable connection with the ignition circuit, the vehicle can lose voltage quickly, and it won’t have the power it needs to keep running as you slow down.

Faulty idle air control actuator: The idle air control actuator controls the engines RPMs when it is idling. This actuator receives information from the electronic control unit (ECU) so it knows at what RPM to keep the engine for a smooth and safe idle. When the actuator malfunctions, the engine gets no signal for idling speed and stops working.

Clogged or restricted EGR Valve: If your EGR valve is clogged, dirty, or defective it can cause your car to stall, idle erratically, or sputter, depending on whether it is stuck open or close


Posts: 1045 | From: City | Registered: Oct 2012  |  :
Rigo5.0
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This is excellent.

Thank you, Martinna.

--------------------
91 5.0 [331|T56]
87 Grand National
02 Z06
09 CBR 600
08 SRT Challenger
13 Shelby GT500
00 Lightning

Posts: 1452 | From: Kansas City | Registered: Jan 2005  |  :
SLOWSN95
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Member # 8269

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Does it stall every time you brake hard? Have you tried hard braking in neutral? Are these hard stops attempted at speeds higher than 40mph? Torque converter should lock around that speed.

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94' GT
347 Stroker
MM Suspended

2003 SB SVT Lightning
Pullied and Lowered

89'Hatch-SOLD

Posts: 2191 | From: 510/east bay | Registered: Mar 2008  |  :
Rigo5.0
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quote:
Originally posted by SLOWSN95:
Does it stall every time you brake hard? Have you tried hard braking in neutral? Are these hard stops attempted at speeds higher than 40mph? Torque converter should lock around that speed.

I will try in neutral.

Thanks Slowsn95.

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91 5.0 [331|T56]
87 Grand National
02 Z06
09 CBR 600
08 SRT Challenger
13 Shelby GT500
00 Lightning

Posts: 1452 | From: Kansas City | Registered: Jan 2005  |  :
NK2186
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Member # 12319

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clean your throttle body really good, the carbon buildup can cause this problem.

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90 LX 5.0 - Stolen/stripped
89 LX 5.0 - Stolen and missing as of 7-24-13. LIC# 4HIP151 :(
99 Cobra
00 Exploder

Posts: 395 | From: Haystack | Registered: Aug 2012  |  :


 
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