Sport trac P0320 after 20-30 minutes

Tiny
TRICE25686
  • MEMBER
  • 2005 FORD EXPLORER
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,300 MILES
Just replaced engine in 05 sport trac (4.0 SOHC). Ran great for about 25 minutes then started hesitating and stalling bad then throwing p0320 code finally got to point wouldn't start unless allowed to sit for 20 minutes or so (hood open). Replaced ckp sensor seemed to have fixed it until about an hour of driving later. Doesn't die anymore but wont accelerate in gear below 1500RPM once above that range seems to do fine. Engine revs in neutral just fine but stumbles under a load. Can not duplicate symptoms unless running for 20 plus minutes. Plan on replacing wires from pcm to crank sensor tonight with a new pigtail at the sensor but want to know if anyone experienced this before. (Engine replaced due to timing chain guide failure)
Wednesday, May 28th, 2014 AT 9:43 AM

20 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Here is a tip from our tips page
vehicle may have a dies or no start condition with multiple DTCs. P0320, P0581, P0606, P2105, P2106.

Diagnose engine speed DTCs first. These DTCs will induce TAC DTCs.

Possible source of engine speed DTCs is a crankshaft pulley that is separated. The outer ring comes off and contacts the crank sensor.
Also can be from a two way radio transmitter as well as highleakge form plug wires one other thing is to check for harness damage at back of engine some models have this problem anc check fuelpressure with a gauge autoparts rent it. May be low
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Wednesday, May 28th, 2014 AT 9:56 AM
Tiny
TRICE25686
  • MEMBER
  • 9 POSTS
Fuel pressure steady 49-52psi running. No marks on sensor of any form from surface contact with reluctor wheel. Plugs and wires are brank new and tested for any form of electrical leaking. The engine speed DTC is what I've been attempting to diag. For 2 days without throwing parts at it. Could the coil overheating cause this issue? Or possible wiring getting hot and losing connection?
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Wednesday, May 28th, 2014 AT 10:10 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I don't think the coil overheating but if it's arcing yes it could /can cause this. There has been some instances of this being set because of salt water intrusion into the crank position sensor. Teh cure for that is to remove connectorand put dielectric grease in it as long as the ckp is good. Then check between ckp sensor harness and ckp sensor if more than 5 ohms check ground on ckp harness which is by pcm and negative battery shold be greater than 10 ohm if all else fails you have to reflash read only programmable memory it has to be something stupid causing this as it takes a while for it to show up. Maybe battery to engine grounds. I have no further suggestions for this.
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Wednesday, May 28th, 2014 AT 12:11 PM
Tiny
TRICE25686
  • MEMBER
  • 9 POSTS
Going to clean all grounds and run ohm tests tonight hopefully findings will show me something useful. If not I'll reflash PCM Saturday. Thanks again for the help, if I come to a conclusion that doesn't require a high powered rifle aimed at ford emblem on front I will be sure to post.
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Wednesday, May 28th, 2014 AT 1:19 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
What I sent is all I could find I know things can be really aggravating sometimes. Try the dielectric grease to maybe that will cure it unless it's a poor connection.
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Wednesday, May 28th, 2014 AT 1:21 PM
Tiny
TRICE25686
  • MEMBER
  • 9 POSTS
Update on sport trac! All of the items above plus, Replaced coil, disconnected all 02s trans output shaft sensor and intermediate shaft sensors both ohm in spec and checked trans harness for any damage. Ckp tests perfect (tested with snap-on verus and Ford IDS), tried all sensors possible. This thing is killing me! Does anyone have any possible idea of where to go from here. Vehicle will only stutter after running 20+ minutes with hood closed and will only do it sitting still with brake depressed while on throttle or accelerating from dead stop until speedometer moves off of 0 mph then runs great.
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Thursday, June 5th, 2014 AT 5:46 AM
Tiny
TRICE25686
  • MEMBER
  • 9 POSTS
Also have replaced computer, and run new wire and pigtail from pcm to ckp.
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Thursday, June 5th, 2014 AT 5:48 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
This may sound stupid as I haven't seen it have you tried cleaning throttle plate on both sides and iac hole with choke cleaner yet? Try that then take a vacuum reading off of intake when doing this.
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Thursday, June 5th, 2014 AT 6:03 AM
Tiny
TRICE25686
  • MEMBER
  • 9 POSTS
Have not tried that yet as of my mind being stuck in "electrical failure" mode I suppose. Will try that this afternoon after work.
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Thursday, June 5th, 2014 AT 6:08 AM
Tiny
TRICE25686
  • MEMBER
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Baffles me because vehicle WILL NOT do it until running for 20+ minutes or longer with hood closed dependant on ambient temp and will not do it unless in gear and from a dead stop or if "power breaking" and only does it until speedo needle moves from zero.
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Thursday, June 5th, 2014 AT 6:12 AM
Tiny
HMAC300
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I tmay be idling to low or throttle plate is stickingso if you clean it it normally fixes that.
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Thursday, June 5th, 2014 AT 6:30 AM
Tiny
ERWIN EDUARDO BACILIO
  • MEMBER
  • 7 POSTS
Hello good day, I would like to know if you found the problem of the vehicle, because I have a Ford Explorer Sport Trac with the same fault I just changed the distribution and it looks like this, I don't know what else to do, I have already done everything, the same that you have done and I have not managed to solve the problem, I hope you can help me I would be very grateful since I don't know what else to do.

Hola buen dia, me gustaria saber si encontraste el problema del vehiculo, porque tengo un ford explorer sport trac con la misma falla solo le cambie la distribucion y quedo asi, ya no se que mas hacer, ya le he hecho de todo, lo mismo que tu has hecho y no he logrado solucionar el problema, espero me puedas ayudar estaria muy agradecido ya que no se que mas hacer.
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Tuesday, July 23rd, 2019 AT 8:09 AM
Tiny
TRICE25686
  • MEMBER
  • 9 POSTS
It was the harmonic balancer, once engine was warm the rubber between balancer sections would become soft and allow the balancer sections to deflect from each other and throw the timing off.
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Tuesday, July 23rd, 2019 AT 12:08 PM
Tiny
ERWIN EDUARDO BACILIO
  • MEMBER
  • 7 POSTS
Hello, thank you very much friend for the information, but what do you say the ammonic balancer, maybe it is the one with a separate chain in the carter or is what we know as the balance bar that takes with the chains of the camshafts.
I thank you in advance for your help.

Hola, muchas gracias amigo por la informacion, pero a que le dicen ustedes el balanceador amornico, talvez es el que lleva con una cadena aparte en el carter o es la que conocemos como la barra balanceadora que coge con las cadenas de los arboles de levas.
Te agradezco de antemano por tu ayuda.
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Tuesday, July 23rd, 2019 AT 7:36 PM
Tiny
ERWIN EDUARDO BACILIO
  • MEMBER
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Do I have to change the balancer or what part of the bar should I change? Or what parts are changed friend.
 tengo que cambiar el balanceador o que parte de la barra debo cambiar? O que piezas se cambian amigo.
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Tuesday, July 23rd, 2019 AT 7:39 PM
Tiny
ERWIN EDUARDO BACILIO
  • MEMBER
  • 7 POSTS
Friend, what causes these rubbers to soften, or is it normal for the time the van is used? Sorry for so many questions friend, but this fault has given me many problems and I want to learn, thanks.
Amigo, cual es la causa de que se suavicen esos cauchos, o es normal por el tiempo de uso de la camioneta? Disculpa tantas preguntas amigo, pero es que esta falla me ha dado muchos problemas y quiero aprender, gracias.
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Tuesday, July 23rd, 2019 AT 7:44 PM
Tiny
ERWIN EDUARDO BACILIO
  • MEMBER
  • 7 POSTS
Excuse me friend, the harmonic balancer I think it is, what we know as a balancing pulley, right.
Disculpa amigo, el balanceador armonico creo que es, lo que nosotros conocemos como polea balanceadora, verdad.
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Tuesday, July 23rd, 2019 AT 7:55 PM
Tiny
TRICE25686
  • MEMBER
  • 9 POSTS
Yes, it is the main crankshaft pulley that runs the belt drive system and helps prevent engine vibration. The rubber between the two sections degrades over time and eventually fails.
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Wednesday, July 24th, 2019 AT 2:10 AM
Tiny
ERWIN EDUARDO BACILIO
  • MEMBER
  • 7 POSTS
Thank you very much friend, today I am going to prove that to you and then I tell you how it went, I am very grateful for the information.
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Wednesday, July 24th, 2019 AT 5:42 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Here is a guide to help you:

https://www.2carpros.com/articles/how-a-harmonic-balancer-works

Please let us know if you need anything else to get the problem fixed.
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Saturday, July 27th, 2019 AT 12:19 PM

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