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Author
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Topic: 5.0 dies on cold start but stays on if i give it gas
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ed650
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Member # 9897
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posted
 
 
so in the mornings when i turn on my 86 5.0 it dies right away, i try again and it dies, it only stays on if i give it gas as soon as i turn it on. this doesnt happen when my car is warm already. does anybody know what it is?
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410w Hatch
306Ci Coupe
Posts: 1744 | From: menlo park | Registered: Apr 2010
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Smoked50
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Member # 9592
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posted
Check your iac valve and tps sensor
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1993 4 Cyl - 68 RWHP
I live my life a quarter mile at a time. For those 25 seconds or less, I'm free.
Posts: 2262 | From: EB | Registered: Nov 2009
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Jaejae5.0
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Member # 7958
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posted
iac^
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1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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Stangn5oh
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Member # 10875
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posted
Whats iac?
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88 lx
17 Renegade turbo
18 Compass 4x4
Hit the gasser, go faster, all u heard was dual exhaust n flowmasters.
Posts: 1643 | From: Sacramento | Registered: Apr 2011
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Stang66
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Member # 10504
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posted
Idle air control, the tube looking thing by the throttle body
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1966 Ford Mustang
1990 Notchback
1975 Pontiac Trans Am 400ci
Posts: 754 | From: Stockton | Registered: Dec 2010
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SLOWFOX
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Member # 11067
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posted
I thought that was the tps...
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" A Wolf under sheep's clothing"-svoRICK 2/10/12
Almost everything I asked for.
Posts: 2399 | From: ESSJ | Registered: Jul 2011
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ed650
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Member # 9897
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posted
so this problem doesnt involve the fuel pump? it idles fine after i give it gas.
[ December 27, 2011, 12:49 PM: Message edited by: ed650 ]
Posts: 1744 | From: menlo park | Registered: Apr 2010
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5.0 LsX
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Member # 10017
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posted
the fuel pump either works or it doesnt, is it carbed or fi?
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91' Notch
Posts: 1260 | Registered: May 2010
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COPFITY
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Member # 1845
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posted
If it was your fuel pump it wouldnt run at all. try these steps below
1. Clean TB with carb cleaner and nylon brush (toothbrush size). Engine off, fully open TB blade and spray/brush TB until all gunk and oil residue is cleaned.
2. Allow to dry, or close TB blade and start engine until it clears all carb cleaner fumes/liquid.
3. Let engine idle...if it doesn't, increase idle speed via TB stop screw until engine stays idling on its own.
4. Disconnect IAC valve, if engine dies repeat 3 with IAC disconnected.
5. Set idle speed to the lowest setting possible between 650-850 rpms with IAC disconnected. It is key to use the lowest possible to prevent idle surge, rolling, etc once the IAC is connected as follows.
6. Turn engine off, and reconnect IAC
7. With Ign On Eng Off, check TPS voltage output....if it's between .8vdc - 1.0vdc, it's OK. This voltage check should be done between the Green and Black wires at the TPS side connector as shown in the pic below (FYI: Green = TPS Signal, Black = SIGRTN, and Orange = VREF)....(-) terminal of the DVOM on the Black wire and (+) terminal on the Green wire.
8. Disconnect battery (-) for 3-4 minutes.
9. Reconnect battery, start engine, allow it to idle for 2-4 minutes to confirm setup,
10. If idle speed falls too low or stalls, increase idle speed via the TB set screw a little at a time.
11. Turn engine off for 20 seconds, re-start engine and repeat 9 - 11 if required.
12. Reconfirm TPS output is within the .8vdc - 1.0vdc range optimum range.
NOTES:
1. No need to reset ECM KAM (reset computer), the TPS minimum value used for idle control, is reset automatically by the EEC-IV every time the ign is cycled on-off for 20 seconds-on.
2. If the TPS output is within 6vdc - 1.1vdc, it's still acceptable, since no TPS failure codes will be generated, and it falls within the EEC-IV .5vdc - 1.19vdc working range.
13. Allow a 10-20 minute "relearning" period under normal driving conditions (drive cycle).....you're done!
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'92 Mustang LX Coupe
-Procharger P600
'71 Camaro Project
'97 Saturn SL1(saving the planet)
Posts: 884 | From: Pittsburg CA... No "H" cuz we don't hate! | Registered: Sep 2002
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SlowStockFox
Stock Fox
Member # 1081
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posted
quote:
Originally posted by COPFITY:
If it was your fuel pump it wouldnt run at all. try these steps below
1. Clean TB with carb cleaner and nylon brush (toothbrush size). Engine off, fully open TB blade and spray/brush TB until all gunk and oil residue is cleaned.
2. Allow to dry, or close TB blade and start engine until it clears all carb cleaner fumes/liquid.
3. Let engine idle...if it doesn't, increase idle speed via TB stop screw until engine stays idling on its own.
4. Disconnect IAC valve, if engine dies repeat 3 with IAC disconnected.
5. Set idle speed to the lowest setting possible between 650-850 rpms with IAC disconnected. It is key to use the lowest possible to prevent idle surge, rolling, etc once the IAC is connected as follows.
6. Turn engine off, and reconnect IAC
7. With Ign On Eng Off, check TPS voltage output....if it's between .8vdc - 1.0vdc, it's OK. This voltage check should be done between the Green and Black wires at the TPS side connector as shown in the pic below (FYI: Green = TPS Signal, Black = SIGRTN, and Orange = VREF)....(-) terminal of the DVOM on the Black wire and (+) terminal on the Green wire.
8. Disconnect battery (-) for 3-4 minutes.
9. Reconnect battery, start engine, allow it to idle for 2-4 minutes to confirm setup,
10. If idle speed falls too low or stalls, increase idle speed via the TB set screw a little at a time.
11. Turn engine off for 20 seconds, re-start engine and repeat 9 - 11 if required.
12. Reconfirm TPS output is within the .8vdc - 1.0vdc range optimum range.
NOTES:
1. No need to reset ECM KAM (reset computer), the TPS minimum value used for idle control, is reset automatically by the EEC-IV every time the ign is cycled on-off for 20 seconds-on.
2. If the TPS output is within 6vdc - 1.1vdc, it's still acceptable, since no TPS failure codes will be generated, and it falls within the EEC-IV .5vdc - 1.19vdc working range.
13. Allow a 10-20 minute "relearning" period under normal driving conditions (drive cycle).....you're done!
cafords ![[patriot]](graemlins/patriot.gif)
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i walk around....dont drink and drive
Posts: 2957 | From: cali | Registered: Mar 2002
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