Author Topic: Pulsating 156  (Read 261 times)

0 Members and 1 Guest are viewing this topic.

sportiva

  • Sr. Member
  • ****
  • Posts: 476
  • ooVoo
Pulsating 156
« on: March 09, 2019, 04:12:38 PM »
My 2.0 JTS has developed symptoms I have not experienced before. The fan blower pulsates the lights pulsate and the car rocks gently forward and back and all of these occur in unison. I removed the serpentine belt to stop drive to the alternator, and on battery power alone all is good. After reinstalling the belt the pulsating returns. I checked the voltage at the battery with the engine running 12.5-13.5 in cycles I suspect an alternator or regulator. Can the brains trust offer any other possibilities
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

poohbah

  • Hero Member
  • *****
  • Posts: 1841
Re: Pulsating 156
« Reply #1 on: March 09, 2019, 06:16:43 PM »
Try an exorcism?
Now:    1999 156 V6
             1981 GTV
Before: 2001 156 V6 (sadly cremated)

105gta

  • Full Member
  • ***
  • Posts: 125
Re: Pulsating 156
« Reply #2 on: March 09, 2019, 06:51:00 PM »
Sounds a like a reg breaking down under load. Check and clean the main contacts between the reg and the alt (17mm nut and philips head screw from memory)and both main connectors (big and small cable) to the alternator including batt end of main cable and earth cable from batt to eng. If all seems ok. Do a voltage drop test of main cables/connections (while running!)
1967 Giulia Sprint GT Veloce (WIP)
1985 GTV6 (WIP)

sportiva

  • Sr. Member
  • ****
  • Posts: 476
  • ooVoo
Re: Pulsating 156
« Reply #3 on: March 09, 2019, 07:01:13 PM »
I tried an exorcism poobah, I belted it many times with a tree branch just like Basil Fawlty nothing changed.
105gta I will check and test your recommendations and see how things go

Thanks 
« Last Edit: March 09, 2019, 08:47:15 PM by sportiva »
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

CitroŽnbender

  • Hero Member
  • *****
  • Posts: 1291
  • Gen. 3:19
Re: Pulsating 156
« Reply #4 on: March 09, 2019, 08:39:13 PM »
How's your block ground?  If that's good, then yes, an internal refresh should see you good. Might just need brushes.

sportiva

  • Sr. Member
  • ****
  • Posts: 476
  • ooVoo
Re: Pulsating 156
« Reply #5 on: March 09, 2019, 08:45:07 PM »
The ground is good. I have a spare alternator so I will swap and see
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

sportiva

  • Sr. Member
  • ****
  • Posts: 476
  • ooVoo
Re: Pulsating 156
« Reply #6 on: March 17, 2019, 07:37:31 PM »
To close this thread. Worn regulator brushes! see photo
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

CitroŽnbender

  • Hero Member
  • *****
  • Posts: 1291
  • Gen. 3:19
Re: Pulsating 156
« Reply #7 on: March 17, 2019, 09:37:06 PM »
Happy to have helped. 😉

sportiva

  • Sr. Member
  • ****
  • Posts: 476
  • ooVoo
Re: Pulsating 156 JTS
« Reply #8 on: March 18, 2019, 07:44:38 PM »
I removed the alternator out the top by undoing the top engine stay then loosening the bolt for the right front engine mount and with a jack under the engine I lowered and moved the engine forward enough to pull the air box and get access to the alternator. My car is a JTS and it has a different front exhaust section than the twin sparks as a consequence, I did not have to unbolt the exhaust the engine moved forward and down with the flex pipe allowing the movement. You do need to undo a lot of electrical connectors, vacuum, and fuel lines so it's a good time to clean the connectors and check the condition of fuel lines. One advantage is you don't have to get under the car. except for the lower splitter and engine mount bolt. It would not bother me to do it this way again. I have only owned this car for twelve months so learning all the time about front drive east/west engine configuration's and how to work on them. And it makes working on the GTV6 I have had for 25yrs easy in comparison. 
« Last Edit: March 18, 2019, 07:52:59 PM by sportiva »
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners