Engine seems to shut down for 1 or 2 seconds

Tiny
TONYMACIAS
  • MEMBER
  • 1986 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 185,000 MILES
Recently I noticed a sensation of shifting into overdrive but upon repeated reacurance I noticed it was in fact the engine losing power for just a second or two at high speed. If coming to a stop while this happens it will stall. It wont happen until the engine is at normal operating temp. Ive replaced the control mod, the coil, and even the fuel emissions reservoir. If I disconnect the Temp sensor it raises the Idle as expected and it no longer tries to intermittently die while driving. I thought it was electrical but now wonder if it could be a temporary fuel disruption. This one has me baffled. Thanx for any help you may render me. Tony M
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Thursday, January 15th, 2009 AT 12:25 AM

4 Replies

Tiny
BILLYMAC
  • EXPERT
Hi tony. If it were mine.I would clean the throttle bores with carb cleaner. Check the egr valve for sticking and carbon. Check the plug on the coil they have the tendacy to loosen check all elec plugs. Do these checks while at idle. At ford we do atest called wiggle test. Just wiggle all wires and connections. Try and recreate the symtom /hope this helps if not feel free to write back. Billymac
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Friday, January 16th, 2009 AT 4:23 PM
Tiny
TONYMACIAS
  • MEMBER
Thanx Billymac I appreciate the help. I have done all the things you mentioned and even replaced the 02 sensor. Ran a fuel pressure gauge from the fuel rail to the cab and watched pressure while driving. No throttle while coasting 35 psi. Throttle while accelerating 45 psi and when cold even a little higher. As soon as it reaches normal temp it now intermitantly bogs and acts like its running out of fuel. At that time I have to disconnect temp sensor in order to get it home. Fuel pressure does not change when its missing. As I stated earlier I replaced the control mod, coil filters, and emmision canister, but cold or warm it seems to be lacking a lot of power. I was an auto shop owner in the mid 80s but Ive run out of answers on this one
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Monday, January 19th, 2009 AT 11:32 PM
Tiny
BILLYMAC
  • EXPERT
Hi tony, I think we have ruled a fuel delivery prob out. Possibly catilatic converter plugged or even a restriction in exhaust have back pressure tested. Another possibility is the stator assy in distributor. Did you scan eng for hard codes? Let me know billymac.
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Tuesday, January 20th, 2009 AT 8:50 AM
Tiny
TONYMACIAS
  • MEMBER
Hi Billymac. As far as scanning for codes, the 86 is the only year they dont sell a scanner for. All the books say take it to ford. Ive checked the backpressure to the best of my ability and Im not finding any signs of a restriction.(No hissing and normal exhaust output without excessive heat on exhaust) As soon as I plug it by hand it does make a hissing sound where its leaking through the joints prior to the catylitic. I was going to replace the Stater assy but disconnecting the temp sensor seemed to cure the problems that one would associate with a faulty stator. Power wise it almost feels as though it is a tooth off on the timing chain but that isnt the case. I was on the highway recently and it acted as though it was running out of gas at as light throttle position. I had to puill over and disconnect the temp sensor in order to get it home and other than being a little low on power it ran ok. Hey thanx for your time and if you can help to figure this one out Ill make it up to you. Tony
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Tuesday, January 20th, 2009 AT 10:36 AM

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