No power at high RPM

[LX470 AUS]

The problem has been there since I bought it, but I didn't really notice it too much from the start, so it might be getting a bit worse with time.
The muffler is welded on, so a saw job.
Yes I have noticed that techstream says it is in 2nd when in park, I'm not sure how this would effect anything though?
Some live data screen shots would be great for comparison. On their own they don't mean that much to someone without much experience on ECU parameters - Thanks Paddo

 

[LX470 AUS]

The easiest way to check for exhaust restriction at high rpm would be to hook up a pressure gauge into one of the o2 sensor plugs and measure exhaust back pressure at idle, then 3500 rpm. I just haven't been able to find one at an auto parts store (which surprises me). Even the exhaust shops I visited said they dont have one and never test for backpressure.

 

[Wilsil]

Where in Perth are you?
I am NOR.

 

[LX470 AUS]

Bibra Lake (SOR), I can come to you if you are willing to lend me a MAF for 10 minutes. I have OBD11 port and laptop with techstream if you ever need it.

 

[Throttle Crazy]

Any chance the previous owner had T-belt done and they have either the intake or exhaust cam retarted by just a tooth or two. I'm new to the 100 series but was a tech for 16 years and have seen a few belts installed with the exhaust cam retarded a tooth and for the most part the engine runs ok but under load lacks power.

 

[CappyKD]

Any chance the previous owner had T-belt done and they have either the intake or exhaust cam retarted by just a tooth or two. I'm new to the 100 series but was a tech for 16 years and have seen a few belts installed with the exhaust cam retarded a tooth and for the most part the engine runs ok but under load lacks power.

I was thinking the same thing.

 

[2001LC]

I've been think same about TB, easy to check.

You might have more luck finding a manometer, HVAC guy's have them or buy a used one off ebay. You'll need a reading upstream and down stream to see the difference. Question: what is and acceptable difference & BackPressure. Possible the exhaust system manufacturer could help and they could tell if you have correct system for you application.

You may have the ECM or other component programed for a model with O2 sensors.

Let me ask you again can the PO offer any insight into what has been done/replace on your LX?

Also was your LX in any collision?

 

[Throttle Crazy]

My wife is always asking to use my man-o-meter.

 

[LX470 AUS]

I was thinking about the TB scenario a few days ago too. Could I visually check this by removing the TB cover? The TB was done at 160,000 Kms, the car has 210, 000 Kms. So if this is the case, its been driving around like that for quite some time.
I bought the car from a used car dealer, the PO had traded it in for a newer 100 series Sahara on LPG. So I don't have the PO's contact details.
No sign of collision.

 

[2001LC]

With 50,000 Kms on belt, it was probable not incorrectly installed. Unless it jump a tooth or just was never figure-out and they got sick of it and sold it.


Do you have the FSM for your Aus 1998 LX?

 

[LX470 AUS]

No, no FSM. Would it not show an error code if it had skipped a tooth or two?

 

[2001LC]

You would think so, I'd also think your scan would show neutral not 2nd gear. I could be wrong but that tells me improper data is being report.
Here is and interesting case that did give a code: Valve Timing Adjustment

I've been very surprised more have not jump in here with help. I suppose it's because you have a number of unusual issue. Aftermarket temp gauge is first clue someone didn't care if OEM parts ...... They (PO's) got the job done MacGyver style, hurray for them. Until it just wouldn't run right anymore. This is a very real possibility, and if so, your chasing ghost.

But as I said before modification not my cup of tea, unless one does careful homework first and is prepared for extra maintenance. The PO was not that person from what little I've read here IMHO.

I feel I'm beating a dead horse here, but I'll say it again; get the FSM & parts catalog and start checking parts. Try do determine whats been replaced and verify it is the correct part(s) for your 1988 LX that were installed. ECU or ECM or other component programed for a model 2002 with O2 sensors will give and get mixed signals in your 1998.

You can find FSM & parts cat all over the internet see: free or fee. In it you'll find a bench test for the MAF. If you like I'll post MAF for you now?

 

[LX470 AUS]

If you could post the MAF bench test that would be appreciated. Ill have to order an FSM.

 

[2001LC]

This is from the free download in FAQ which I gave you a link to. It's for a 2004 US series 100. Go and get the whole FSM in FAQ and you'll fine lots of good info, but remember these are series 100 with o2's.

 

[LX470 AUS]

Thanks, Ill have to source the 98 FSM for AUS delivered vehicles.

 

[2001LC]

Your welcome. Once you get a good handle on how to use the 2004 FSM I send you, you may just want to log into the: Toyota pay site. You can buy 24 hours at a time IIRC, it's the first link under maintenance.

 

[Wilsil]

Not sure how easy it is to disconnect the MAF.
I tried when I was cleaning the sensor, but it didn't bulge.
I am in Tapping.

 

[Actualeyes]

Amazing as it seems, someone on here recently appeared to have had a rodent get into the timing belt enclosure and jump the belt a few teeth.

Check the cover is on, and that there's no rodents or gravel etc that may have got in the way.

 

[PADDO]

You would think so, I'd also think your scan would show neutral not 2nd gear. I could be wrong but that tells me improper data is being report.

Don't be concerned about that, its actually saying 2nd gear = NO, ie you're not in second gear. My 03 version reports the status of all gears, CDL, snow start, power/normal etc. Your techstream is reporting correctly.

The potential cam timing issue is definitely worth following. Would explain a lot and possibly account for your idle timing being 8 degrees and not more advanced, maybe the knock sensor is kicking in to retard timing to the point of pre ignition like its suppose to? I'll get some screen shots for comparison asap.

 

[LX470 AUS]

Hey Wilsil, no worries, I did the MAF bench test and it all seems to be functioning ok. Thanks though. My offer still stands if you ever need to hook up to tech stream.
Yes I have read that thread about the rodent causing the TB to skip, I particularly like the detailed drawings of the rodent jammed between the pulley and the belt, it really paints a picture..
Ok, so next I will pull the TB covers and check the alignment of the belt. Is this a 'drive belt off' job, or can I manage with leaving it on? Im sure I will figure it out when I get to it. It'll have to be next week though as I am going away for the weekend..