EFI 4.0L wants to stall? - Pirate4x4.Com : 4x4 and Off-Road Forum

liquidkool · 08-22-2001, 05:26 PM

I have a 93 Wrangler with the 4.0 and it wants to stall when i brake hard or come to a stop real fast. Any ideas what might be causing this to happen

DE Jeeper · 08-23-2001, 08:11 AM

If I have to take a guess I would say it is one of the following... throddle position sensor (TPS), idle air control (IAS) or the speed sensor in the t-case. You should run the check engine sequence for codes. Do a search for the proceedure and codes or buy a factory service manual.

Keith Strong · 08-23-2001, 08:57 AM

Quote:

Originally posted by DE Jeeper:
<STRONG> Do a search for the procedure and codes or buy a factory service manual.</STRONG>

I agree...start with the codes <IMG SRC="smilies/wink.gif" border="0"> The cheap ass Haynes manual has the process you need.

The Rockslut · 08-23-2001, 09:01 AM

I think that in 93 you can check the codes buy turning the key on, off, on, off, on then count how many times the Check Engine light flashes. It will have pauses between codes. flash pause flash flash means Code 12

XJ Hunter · 08-23-2001, 10:13 AM

if it wont idle eiher sounds like the TPS to me.

BlueYJ · 08-23-2001, 12:20 PM

I had a similar problems. Hook a pressure gauge to the injection tube, should run around 30LBS. Mine was 70, found out that I smashed the skid plate up into the fule tank causing the return for the EFI to be pushed against the tank causing the pressure to raise because it couldnt release itself. Unfortunatly had to pull the take to fix everything.

BlueYJ <IMG SRC="smilies/glasses.gif" border="0">

liquidkool · 08-24-2001, 11:38 AM

Ok i checked the engine codes and came up with 12-33-21-15-55. I have gathered that 12 means i accessed the system and 55 means end of codes but i am not sure if i have the other codes right because i could only find a TJ engine code chart.

33-An open or shorted condition detected in the duty cycle purge solenoid circuit.

21-Something to do with the oxygen sensor not working and running above temp

15-No vehicle speed sensor signal detected during road load conditions.

I have no idea what 33 is telling me.
Does 21 mean i need a new O2 sensor? I dont want to replace it if i dont have to because it is 75 bucks.

15- explains why my speedometer isn't working but is it saying my speedometer is broken or something on the t-case end.

Thanks Jim (93 YJ)

liquidkool · 08-25-2001, 04:42 AM

Can anyone help me out on this?

08-22-2001, 05:26 PM	#1 (permalink)
liquidkool Registered User Join Date: Mar 2001 Member # 3737 Location: gray, me, usa Posts: 263	EFI 4.0L wants to stall? I have a 93 Wrangler with the 4.0 and it wants to stall when i brake hard or come to a stop real fast. Any ideas what might be causing this to happen __________________ The more you play with it...The bigger it gets

08-23-2001, 08:11 AM	#2 (permalink)
DE Jeeper Mr. FixIt Join Date: Jun 2001 Member # 5295 Location: Wilmington, DE Posts: 517	If I have to take a guess I would say it is one of the following... throddle position sensor (TPS), idle air control (IAS) or the speed sensor in the t-case. You should run the check engine sequence for codes. Do a search for the proceedure and codes or buy a factory service manual. __________________ '88 YJ with not much '88 YJ left We-Rock Stock Class Team Mall Crawler #609 Sponsored by: The Drive Shaft Shop www.driveshaftshop.com Delaware Jeep Assoc. www.delawareja.com

08-23-2001, 09:01 AM	#4 (permalink)
The Rockslut Registered User Join Date: Jun 2001 Member # 5021 Location: Lincoln, CA Posts: 5,967	I think that in 93 you can check the codes buy turning the key on, off, on, off, on then count how many times the Check Engine light flashes. It will have pauses between codes. flash pause flash flash means Code 12 __________________ Don't be "THAT GUY" on the trail. www.voodoowax.com

08-23-2001, 10:13 AM	#5 (permalink)
XJ Hunter Registered User Join Date: Dec 2000 Member # 2623 Location: Lynchburg, Va Posts: 231	if it wont idle eiher sounds like the TPS to me. __________________ love your unibody im gonna be an astronaut, i hear they get all the tang they want

08-23-2001, 12:20 PM	#6 (permalink)
BlueYJ Registered User Join Date: Apr 2001 Member # 4247 Location: Manteca, CA, USA Posts: 497	I had a similar problems. Hook a pressure gauge to the injection tube, should run around 30LBS. Mine was 70, found out that I smashed the skid plate up into the fule tank causing the return for the EFI to be pushed against the tank causing the pressure to raise because it couldnt release itself. Unfortunatly had to pull the take to fix everything. BlueYJ <IMG SRC="smilies/glasses.gif" border="0"> __________________ Real Jeeps are "BUILT" not bought Hold my wife back damit.......this is my jeep and I will buy what I want for it!

08-24-2001, 11:38 AM	#7 (permalink)
liquidkool Registered User Join Date: Mar 2001 Member # 3737 Location: gray, me, usa Posts: 263	Ok i checked the engine codes and came up with 12-33-21-15-55. I have gathered that 12 means i accessed the system and 55 means end of codes but i am not sure if i have the other codes right because i could only find a TJ engine code chart. 33-An open or shorted condition detected in the duty cycle purge solenoid circuit. 21-Something to do with the oxygen sensor not working and running above temp 15-No vehicle speed sensor signal detected during road load conditions. I have no idea what 33 is telling me. Does 21 mean i need a new O2 sensor? I dont want to replace it if i dont have to because it is 75 bucks. 15- explains why my speedometer isn't working but is it saying my speedometer is broken or something on the t-case end. Thanks Jim (93 YJ) __________________ The more you play with it...The bigger it gets

08-25-2001, 04:42 AM	#8 (permalink)
liquidkool Registered User Join Date: Mar 2001 Member # 3737 Location: gray, me, usa Posts: 263	Can anyone help me out on this? __________________ The more you play with it...The bigger it gets

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