My 94 LC80 is being weird and I dont know where to begin

[Dirty Psyclops]

So, I’m having issues with my 94 Lc with a 1fz. I had to change the PHH which I did then I had to change the knock sensor next to it which I broke while changing the PHH and thats been done too. Now that those have been changed its having yet again more issues. Starting it cold it does not go into the warm up idle sequence where it idles higher, as well as if I drive it, it will be fine until it starts warming up then it starts idling real low and you really have to press into the pedal to get it to go and even then its sluggish and doesn't really want to move. When warm its now idling super low around the second to third mark. When I started it cold the first time I did notice a puff of blueish smoke but other than that one puff it didn't smoke anymore. I dont know what to do or where to start or look any ideas would be appreciated.

I do have another thread here with other problems Ive had if you want to check that out:

D

Thread 'I messed up, any ideas?'

Jul 7, 2026

So I recently “Bought” an 1994 80 series with an 1FzFe from my father. He didn't do much maintenance on it ,so i’m doing my best to tune it up and replace what I can. Part of this process I replaced the following over the weekend.
-Valve cover gasket
- spark plug tube gaskets (+plugs,wires)
- Pcv valve (+ grommet,Hoses)
- Dizzy cap, O ring, and gasket
- Reseal Half Moon
Afterwards I had a terrible Vacuum leak which I chased down to the Throttle body having a crimped gasket which I Fixed. Its now running smooth but the idle is terribly low around 400-450. I messed with the Dizzy to advance...

• Dirty Psyclops
• Replies: 20
• Forum: 80-Series Tech

• 

 

[Dirty Psyclops]

So, I’m having issues with my 94 Lc with a 1fz. I had to change the PHH which I did then I had to change the knock sensor next to it which I broke while changing the PHH and thats been done too. Now that those have been changed its having yet again more issues. Starting it cold it does not go into the warm up idle sequence where it idles higher, as well as if I drive it, it will be fine until it starts warming up then it starts idling real low and you really have to press into the pedal to get it to go and even then its sluggish and doesn't really want to move. When warm its now idling super low around the second to third mark. When I started it cold the first time I did notice a puff of blueish smoke but other than that one puff it didn't smoke anymore. I dont know what to do or where to start or look any ideas would be appreciated.

I do have another thread here with other problems Ive had if you want to check that out:

D

Thread 'I messed up, any ideas?'

Jul 7, 2026

So I recently “Bought” an 1994 80 series with an 1FzFe from my father. He didn't do much maintenance on it ,so i’m doing my best to tune it up and replace what I can. Part of this process I replaced the following over the weekend.
-Valve cover gasket
- spark plug tube gaskets (+plugs,wires)
- Pcv valve (+ grommet,Hoses)
- Dizzy cap, O ring, and gasket
- Reseal Half Moon
Afterwards I had a terrible Vacuum leak which I chased down to the Throttle body having a crimped gasket which I Fixed. Its now running smooth but the idle is terribly low around 400-450. I messed with the Dizzy to advance...

• Dirty Psyclops
• Replies: 20
• Forum: 80-Series Tech

• 

Forgot to add its running rich as it smells of fuel not terrible or in the cab but after parking you van smell the fuel and see unburnt fuel coming from the exhaust

 

[ppc]

Please update your original thread instead of starting a new thread. It will be helpful to others trying to help to know exactly what you have tested, replaced etc.

 

[Dirty Psyclops]

Please update your original thread instead of starting a new thread. It will be helpful to others trying to help to know exactly what you have tested, replaced etc.

Will do thanks, still new to the site

 

[tmxmotorsports]

Have you disconnected the battery?