| | Voltage Drop |  |
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albertj
Master
Name :
Location : Finger Lakes of New York State
Joined : 2007-05-31
Post Count : 8687
Merit : 181
| | Subject: Re: Voltage Drop Fri Feb 24, 2012 12:28 pm | |
| - rivparadise wrote:
- Exactly where is this thermistor? Looked yesterday, dont know what im lookin for!
On the positive battery cable, can't miss it. | |
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rivparadise
Fanatic
Name : Samuel
Age : 52
Location : Niagara Co.
Joined : 2007-06-10
Post Count : 381
Merit : 11
| | Subject: Re: Voltage Drop Mon Feb 27, 2012 3:01 pm | |
| They swapped alternators and still having voltage drop. Dropped off a new PCM today. Hopefully this will get us closer! | |
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AA
Administrator
Name : Aaron
Age : 47
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18452
Merit : 252
| | Subject: Re: Voltage Drop Mon Feb 27, 2012 3:32 pm | |
| They are not charging you for all of these parts are they? It seems they are approaching your situation using a technique we say at work: "throwing shit against the wall to see if it sticks". _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^  '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
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deekster_caddy
Master
Name : Derek
Age : 52
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109
| | Subject: Re: Voltage Drop Mon Feb 27, 2012 3:36 pm | |
| I don't think the problem is the charging system or PCM. The PCM can command the alternator to stop charging below a certain RPM. You are saying how the engine is stumbling to low RPM, this tells me the alternator is doing exactly what it's told.
I am more suspicious of a broken wire somewhere near the firewall connector of the engine harness. If, for example, it were the fuel injector signal wire, you would suddenly have the injectors pulsing wildly. Or, if it were the crank sensor wire, it would stumble or cut out completely. Then because of whatever electrical current jumping voodoo, the connection is reestablished and seems to work fine for a while.
Try wiggling the wire harness near the firewall connector, hard. Try spraying it with water. If either of those affects the engine running, you have located your problem.
(I bolded the crank sensor wire comment because why??) | |
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rivparadise
Fanatic
Name : Samuel
Age : 52
Location : Niagara Co.
Joined : 2007-06-10
Post Count : 381
Merit : 11
| | Subject: Re: Voltage Drop Mon Feb 27, 2012 4:39 pm | |
| LOL! I checked and wiggled all harness' and nothing a few weeks ago. So far they have redone all the grounds which were in terrible shape.
They were getting it to cut out when they jiggled the harness in the back seat. Couldn't get it to do it at the firewall. These guys said it's not leaving until it's fixed. I know one mechanic in the shop is getting sick of it but the owner assured me of success!
This one is truly a stumper! | |
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rivparadise
Fanatic
Name : Samuel
Age : 52
Location : Niagara Co.
Joined : 2007-06-10
Post Count : 381
Merit : 11
| | Subject: Re: Voltage Drop Tue Feb 28, 2012 4:36 pm | |
| So far so good! New computer to replace the one with corrosion and a screw loose, all grounds cleaned and or replaced and a few other little things they said were bad. Went for a three hour drive around town today and NO PROBLEMS! I was going to take it home tonight but getting tires put on in the morning so I left it at the shop. The way it worked out was amazing! My friend took care of the bill at the shop and I have to paint his kitchen! Same guy who drove the car to the shop! No more ticking, was low on oil. I get worried sometimes for nothing. Thank you everyone for being so kind online! Hopefully I can put a fork in this one and drive my sweet Jessica! | |
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deekster_caddy
Master
Name : Derek
Age : 52
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109
| | Subject: Re: Voltage Drop Tue Feb 28, 2012 5:03 pm | |
| Glad it's working out for you! The PCM actually being bad is pretty rare. | |
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rivparadise
Fanatic
Name : Samuel
Age : 52
Location : Niagara Co.
Joined : 2007-06-10
Post Count : 381
Merit : 11
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deekster_caddy
Master
Name : Derek
Age : 52
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109
| | Subject: Re: Voltage Drop Wed Feb 29, 2012 11:24 am | |
| The '98 - '02 3800 PCMs were interchangable with a reflash. So that PCM might have come from another car where it lived under the air cleaner/exposed to the elements. | |
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rivparadise
Fanatic
Name : Samuel
Age : 52
Location : Niagara Co.
Joined : 2007-06-10
Post Count : 381
Merit : 11
| | Subject: Re: Voltage Drop Thu Mar 01, 2012 8:03 pm | |
| Second day with NO PROBLEMS WHATSOEVER! Woo Hoo!  | |
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