Ugh... oil pump, sending unit, other? - Ford Truck Enthusiasts Forums

Notices
Modular V10 (6.8l)  
Sponsored by:
Sponsored by:

Ugh... oil pump, sending unit, other?

Reply

 
 
 
  #1  
Old 12-29-2017, 11:16 AM
74Mav
74Mav is offline
Senior User
Thread Starter
Join Date: Jun 2003
Location: Lake City, Florida
Posts: 304
74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.
Ugh... oil pump, sending unit, other?

Well last night it hit the coldest temps my V10 Excursion has ever seen - minus 12.

The Ex started ok, but, according to the gauge and idiot light, the oil pressure went to normal then down to zero, so I shut it right off. After checking the oil level, it was about a quart low, I tried again. The light went off and the gauge flickered a couple times then back down to nothing. Also, several of the other idiot lights (MIL, low fuel and ABS) came on and off a few times during the short time the Ex was running.

The outside temp is now up above 0 and there's been a heat lamp on the engine for about an hour.

All of this started AFTER the truck wouldn't start last night when my girlfriend got off work. A friend gave the Ex a jump start and she was able to get it home.

During the short time the engine was running, I did not notice any knocking or other types of sounds that would indicate any damage had been done.

I'm hoping it's not the oil pump, and would actually welcome a weak battery or other electrical issue being the culprit. However, my luck doesn't usually run that way...
 
Reply With Quote
  #2  
Old 12-29-2017, 08:35 PM
R&T Babich
R&T Babich is online now
Posting Guru
Join Date: Feb 2011
Location: Thousand Oaks, CA
Posts: 1,086
R&T Babich has a great reputation on FTE.R&T Babich has a great reputation on FTE.R&T Babich has a great reputation on FTE.R&T Babich has a great reputation on FTE.
Can you measure the battery voltage just sitting - should be around 12.2-12.5v.
With the engine running ours shows 13.6-14.2v.
While not a complete test if you have those voltages your battery and alternator are probably good.
Check the battery and ground cable connections for corrosion.
The oil pressure sender is lower on the driver's side, check that connector, too.
The oil pressure gauge is not really a gauge.
The sender is a 7 psi switch so when the oil pressure goes over 7 psi the switch closes and the gauge reads an "OK" level.
When first starting an engine the oil pressure can go over 50 psi with cold oil and drops to a fairly low pressure at idle in a warm engine.
Maybe this concerned people so the "gauge" was simplified.
 
Reply With Quote
  #3  
Old 12-30-2017, 05:48 AM
Krewat's Avatar
Krewat
Krewat is offline
Super Moderator
Join Date: Jul 2002
Location: Long Island USA
Posts: 38,539
Krewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputation
Yeah, I bet the battery is toast, given the rest of the dash lights blinking on and off. Check the battery voltage like R&T says.
 
Reply With Quote
  #4  
Old 12-30-2017, 06:27 AM
74Mav
74Mav is offline
Senior User
Thread Starter
Join Date: Jun 2003
Location: Lake City, Florida
Posts: 304
74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.
I did a load test on the battery yesterday with a hand held tester. When not under load, it shows 12v. When under load, the needle drops to the weak area, and IIRC, about 11v. So I'm sure the battery is on its way out.

I'm picking up a mechanical oil pressure gauge today. I don't want to risk starting it again without that gauge so I can really know what the oil pressure is. This scares the hell out of me, lol. We're expecting more snow next wewk, and the Ex is our only 4wd truck.
 
Reply With Quote
  #5  
Old 01-01-2018, 03:13 PM
74Mav
74Mav is offline
Senior User
Thread Starter
Join Date: Jun 2003
Location: Lake City, Florida
Posts: 304
74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.
Well, with luck, it looks like the sending unit was bad. Changed the oil and filter today at 5 below zero. Started the Excursion, still no oil pressure on the dash gauge. So, I commenced to installing the Bosch mechanical gauge I got at Advance on Saturday.

Started her up, and about 8 seconds later I was greeted with 82 psi.

After about 20 minutes of idling and occasional revng the engine to 2000 rpm, this is where I'm at...

 
Reply With Quote
  #6  
Old 01-01-2018, 03:48 PM
Deagle12
Deagle12 is offline
Senior User
Join Date: Jul 2017
Posts: 163
Deagle12 is gaining momentum as a positive member of FTE.
Code:
"Some 1999-2001 Fords (many models listed including the X) may exhibit low or no oil pressure usually on first start up after several hours of cold soak. To service, replace existing oil pressure switch F8AZ-9278-DA with new pressure switch 1U5Z-9278-DA."
 
Reply With Quote
  #7  
Old 01-01-2018, 09:23 PM
74Mav
74Mav is offline
Senior User
Thread Starter
Join Date: Jun 2003
Location: Lake City, Florida
Posts: 304
74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.74Mav has a very good reputation on FTE.
Originally Posted by Deagle12 View Post
Code:
"Some 1999-2001 Fords (many models listed including the X) may exhibit low or no oil pressure usually on first start up after several hours of cold soak. To service, replace existing oil pressure switch F8AZ-9278-DA with new pressure switch 1U5Z-9278-DA."

Sonofabitch.... all the searching I did and I didn't find that TSB. Well, at least is wasn't the oil pump.
 
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
yasky69
1968-2013 Full Size Vans
3
02-05-2018 07:52 AM
Melissa Recla
Excursion - King of SUVs
3
01-29-2018 06:12 AM
merc4now
6.0L Power Stroke Diesel
40
05-18-2017 02:05 PM
3722
1999 to 2016 Super Duty
2
02-16-2017 03:21 PM
Jesser02EX
1999 - 2003 7.3L Power Stroke Diesel
11
09-16-2016 09:31 AM


Thread Tools
Search this Thread
Quick Reply: Ugh... oil pump, sending unit, other?


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.