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Super slow... normal?


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11 replies to this topic

#1 Theblackpearl

Theblackpearl
  • Location:Salem,or
  • Cars:1970 510, 78 280z black pearl

Posted 02 March 2016 - 10:54 PM

Hey guys so I've got yet another datsun... won't have pics till this weekend but I've got a question.

Stock l24e auto Trans
Well maintained
Engine runs smooth

The problem I'm having is that it's very shaky at all speeds as you speed up the shaking gets faster... initially I thought it was an out of balance/bubbled tire but it's not...
And I am wondering if that could co-encide with the fact that it is soo slow 0-60 23 seconds!!!! I knew the autos were bad but. Are they that bad?

#2 datzenmike

datzenmike
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 03 March 2016 - 06:10 AM

The engine determines the performance and not the transmission. A 23 second 60 time is very poor so look at the tune of the engine. Pull and inspect the plugs. They are a look inside the combustion chamber. The L24 is fuel injection... maybe the flap door on the MAF is sticking or the wiper that it moves over a resistance track is worn. This variable reading tell the ECU how much air is entering the engine so it can work out the mixture. It may idle fine but have poor pick up.


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#3 Theblackpearl

Theblackpearl
  • Location:Salem,or
  • Cars:1970 510, 78 280z black pearl

Posted 04 March 2016 - 07:57 PM

I pulled the plugs and they look fine...

I will check the air flow meter in the morning...

Any insight into the cause of the shaking maybe a bent axle in the rear end... does that happen?

The shaking does not change during braking or under load only speed affects it...

I was thinking motor mount, Trans. Mount, u joints.. but all of those look fine and the u joints usually make a noise first don't they?

Anyway it's confusing me any help would be great...

#4 Theblackpearl

Theblackpearl
  • Location:Salem,or
  • Cars:1970 510, 78 280z black pearl

Posted 05 March 2016 - 06:40 PM

Soooo

I went out to start it this morning and... nothing....

So I went through my plugs and replaced them with ngk bp6es. replaced the wires,replaced the cold start injector, replaced the throttle position sensor, cleaned and reinstalled the air flow meter, and replaced the battery...

And still I have a cranks but no start issue... need help asap.

#5 Theblackpearl

Theblackpearl
  • Location:Salem,or
  • Cars:1970 510, 78 280z black pearl

Posted 07 March 2016 - 12:15 PM

Figured this out....
it ended up being my water temperature switch and thermotime switch both went bad...

For search purposes
Cranks but no start

#6 Lockleaf

Lockleaf
  • Location:Happy Valley, Utah
  • Cars:'71 510 Goon, '90 240SX, '85 720, '69 Roadster, '96 Pathfinder, too much other shite

Posted 07 March 2016 - 12:21 PM

What is the thermotime switch?

Half Pint ('71 510 Goon) http://community.rat...agon/p?=1269361

 

Audrey ('69 Roadster 1600) http://community.rat...rey-the-ratster

 

Tiny Havok ('85 720 DIY built Crewcab 4x4) http://community.rat...ache/?p=1395455

 

720 Shenanigans http://community.rat...20-shenanigans/


#7 Theblackpearl

Theblackpearl
  • Location:Salem,or
  • Cars:1970 510, 78 280z black pearl

Posted 07 March 2016 - 12:35 PM

When you look at your thermostat housing you will see two or three sensors and basically...

the thermotime sensor reads the temperature for 9 seconds, and tells your cold start injector when it should fire on.. it is a water temperature sensor that only works for 9 seconds
Which is why you have that and a water temperature sensor as well as your temperature sending unit it's all part of the L Jetronic fuel injection system..
When your water temperature sensor goes bad your car will run very very very rich or very lean. because it has no idea what the temperature of the car is, and how much fuel it needs to put in. if you're thermo time sensor goes out you will either not be able to start it in the mornings or it will be at high idle and running very very rich.

#8 Theblackpearl

Theblackpearl
  • Location:Salem,or
  • Cars:1970 510, 78 280z black pearl

Posted 07 March 2016 - 12:38 PM

https://www.google.c...4J9SujwPttJXQDA


That is where I found mine.. I'll let you know how it performs as soon as it gets here for now I just have a jumper wire jumping the system so that it always thinks its warm

#9 Lockleaf

Lockleaf
  • Location:Happy Valley, Utah
  • Cars:'71 510 Goon, '90 240SX, '85 720, '69 Roadster, '96 Pathfinder, too much other shite

Posted 07 March 2016 - 01:12 PM

Thanks for the info

Half Pint ('71 510 Goon) http://community.rat...agon/p?=1269361

 

Audrey ('69 Roadster 1600) http://community.rat...rey-the-ratster

 

Tiny Havok ('85 720 DIY built Crewcab 4x4) http://community.rat...ache/?p=1395455

 

720 Shenanigans http://community.rat...20-shenanigans/


#10 Theblackpearl

Theblackpearl
  • Location:Salem,or
  • Cars:1970 510, 78 280z black pearl

Posted 07 March 2016 - 01:13 PM

Yeah no worries

#11 Datsunawi

Datsunawi
  • Location:WA
  • Cars:73 610, 620 79, 810 79, another 810 79

Posted 13 March 2016 - 09:03 PM

you figured out the shaking source??

 

If not I would suggest checking the driveshaft bearing/carrier (someone correct the name of the part if wrong), anyways, it will be located at the middle of the driveshaft, with the driveshaft going through it. when these go bad, the car vibrates increasingly as you go up in speed, and specially if you apply more power.

 

it will happen very strong, if you take off hard.

 

Let us know.

 

And please post some pics, would love to see another 810.

 

NOTE: if nothing makes sense feel free to say so, English is not my mother tongue.

 

Best,

Moe 



#12 Theblackpearl

Theblackpearl
  • Location:Salem,or
  • Cars:1970 510, 78 280z black pearl

Posted 21 March 2016 - 08:23 PM

Thank you it was the carrier bearing she cruises like a cadillac now