Running rough under load

[hammerheadfistpunch]

Did you do a compression check when you swapped out the spark plugs?

I didn't. I planned on doing it when I got around to them at 300k but I was just checking then and decided to get it done then.

 

[hammerheadfistpunch]

No special tools needed, but before you spend the money with Rock Auto I'd check with Toyota. The reason i say that, when i just replaced the ones on my LC, the factory ones were a few dollars less than the Denso's from Rock Auto, plus the factory ones came with new nuts, and gaskets. Believe me, you'll NEED NEW NUTS, the factory ones are almost always eaten up to the point where there are no flats left on them.

Ordered some new sensors from Densoproducts.com on recommendations from @beno Turns, out the OE Toyota branded stuff is 3-x times more, even through non-dealer sources.

Got OE gaskets and nuts and ordered me a 17801-61030 washable filter while I was at it.

 

[Rifleman]

I just looked up my truck (1994) on Densoproducts.com web site, they want 145 bucks each for O2 sensors for my truck, i bought new ones from Toyota under the SPECIAL SERVICE CAMPAIGN for 240 bucks for the pair. Then i looked up your year on their web site (1997) at a cost of 50 bucks each. The reason i told you to go with Toyota, i thought the sensors were the same across all 1FZ FE engines, and you could save some money. But Toyota must of went with a different type of sensor after the 1994 model year, thereby saving you some big bucks by going with aftermarket sensors! Below is a link to the Toyota special service campaign for the O2 sensors used on my truck.
http://www.risingsun4x4club.org/upl...r manual/Service bulletin/T-CP-SO2-0162-W.pdf

 

[hammerheadfistpunch]

I just looked up my truck (1994) on Densoproducts.com web site, they want 145 bucks each for O2 sensors for my truck, i bought new ones from Toyota under the SPECIAL SERVICE CAMPAIGN for 240 bucks for the pair. Then i looked up your year on their web site (1997) at a cost of 50 bucks each. The reason i told you to go with Toyota, i thought the sensors were the same across all 1FZ FE engines, and you could save some money. But Toyota must of went with a different type of sensor after the 1994 model year, thereby saving you some big bucks by going with aftermarket sensors! Below is a link to the Toyota special service campaign for the O2 sensors used on my truck.
http://www.risingsun4x4club.org/uploads/Snowrun/1994 fzj80/1994 Repair manual/Service bulletin/T-CP-SO2-0162-W.pdf

Interesting, good to know! In either case, Im glad I was able to not spend dealer prices. They wanted nearly $400 for the pair. Hell nay.

 

[inkpot]

Nope.

Does your CEL come on briefly when you first turn on the key?
If “NO “ then maybe the bulb is burned out?

 

[hammerheadfistpunch]

Does your CEL come on briefly when you first turn on the key?
If “NO “ then maybe the bulb is burned out?

No, it works. Also i have a reader that would display faults even with a burnt out light

 

[ppc]

I just looked up my truck (1994) on Densoproducts.com web site, they want 145 bucks each for O2 sensors for my truck, i bought new ones from Toyota under the SPECIAL SERVICE CAMPAIGN for 240 bucks for the pair. Then i looked up your year on their web site (1997) at a cost of 50 bucks each. The reason i told you to go with Toyota, i thought the sensors were the same across all 1FZ FE engines, and you could save some money. But Toyota must of went with a different type of sensor after the 1994 model year, thereby saving you some big bucks by going with aftermarket sensors! Below is a link to the Toyota special service campaign for the O2 sensors used on my truck.
http://www.risingsun4x4club.org/uploads/Snowrun/1994 fzj80/1994 Repair manual/Service bulletin/T-CP-SO2-0162-W.pdf

According to @cruiserdan the 93 and 94 models are NTK not Denso
O2 sensor Denso or NTK being OEM?

 

[Malleus]

Ordered some new sensors from Densoproducts.com on recommendations from @beno Turns, out the OE Toyota branded stuff is 3-x times more, even through non-dealer sources.

Got OE gaskets and nuts and ordered me a 17801-61030 washable filter while I was at it.

Good to know. @beno comes through again!

Interesting that they have both sensors for 01/95 onward, but only the upstream (at 3x the price) for models up to 01/95.

 

[Tools R Us]

Good to know. @beno comes through again!

Interesting that they have both sensors for 01/95 onward, but only the upstream (at 3x the price) for models up to 01/95.

The OBD system doesn't use a downstream sensor. Search NTK 24044 & NTK 24080. IIRC, the only difference is wire length, the NTK 24044 is longer, so can be used in both locations.

 

[Malleus]

That's what I remember from looking into this for my '94. I was just commenting on the fact that the (1) sensor for the '94 is 3x the cost of the (2) sensors for the '95-'97.

 

[Tools R Us]

That's what I remember from looking into this for my '94. I was just commenting on the fact that the (1) sensor for the '94 is 3x the cost of the (2) sensors for the '95-'97.

I guess that depends on where you shop, the NTK 24044 can be had for ~$60. On the OBD rigs both are critical, on the OBD2, only the upstream is crucial, so can get away with just the one.

 

[hammerheadfistpunch]

Well, it wasn't the O2 sensors. Im off to hunt down vacuum leaks next.

Something else I noticed that may or may not be related. its getting hotter now, like 198F over mountain passes even on cold days (30 F or colder). Its a brand new radiator, the fan clutch is blue hub and good, its been burped and the T-stat is good. hmmm.

 

[baldilocks]

Well, it wasn't the O2 sensors. Im off to hunt down vacuum leaks next.

Something else I noticed that may or may not be related. its getting hotter now, like 198F over mountain passes even on cold days (30 F or colder). Its a brand new radiator, the fan clutch is blue hub and good, its been burped and the T-stat is good. hmmm.

How much hotter than normal?

 

[hammerheadfistpunch]

How much hotter than normal?

I used to never go above 190 on hot days

 

[Starlord]

Have you tried checking or cleaning your MAF sensor?

 

[hammerheadfistpunch]

Have you tried checking or cleaning your MAF sensor?

Yes to both. Reporting correct resistance and voltage

 

[Starlord]

Sounds like a vacuum leak. You can run the car at idle and spray it down with carb cleaner. If the idle picks up you know where the leak is.

 

[hammerheadfistpunch]

Sounds like a vacuum leak. You can run the car at idle and spray it down with carb cleaner. If the idle picks up you know where the leak is.

That's the plan but probably with argon/co2 cause it's handy and not burny

 

[hammerheadfistpunch]

Update: intake tube was badly cracked. Its now replaced and it and it's better but still light knocking when cold and on throttle lift and still "burbles" under load. Fuel trim is still wacky.

 

[JZenger]

Hammerheadfishpunch, did you ever get this figured out? I am chasing what appears to be a very similar issue and not having much luck. Currently at the shop and they are not having much luck either.