1FZ-FE - lack of power

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Beast of Berlin

Beast of Berlin

Joined
Aug 10, 2019
Threads
15
Messages
117
Location
Germany
There is a lack of power currently with the 1FZ-FE. I have changed the fuel filter and it got better but not like before. I assume something else is clogging downstream…!? Has anyone made similar experiences with fuel filters or fuel tubes? Even took apart the whole exhaust-pipes having assumed that something broke in the catalysts and might clogged there – a piece of the inner structure has vagabonding was my guess. Just one of those was mounted against the marked arrow direction of flow bolted on the outside. But this was since years and had no effect on the power so far. I could not mounted it accordingly in arrow direction due to tube overlap at the flanges both sides (catalyst and mating). The whole exhaust-pipe parts except exhaust manifold were ordered from ROCK-AUTO… not high end.
 
Beast of Berlin said:
There is a lack of power currently with the 1FZ-FE. I have changed the fuel filter and it got better but not like before. I assume something else is clogging downstream…!? Has anyone made similar experiences with fuel filters or fuel tubes? Even took apart the whole exhaust-pipes having assumed that something broke in the catalysts and might clogged there – a piece of the inner structure has vagabonding was my guess. Just one of those was mounted against the marked arrow direction of flow bolted on the outside. But this was since years and had no effect on the power so far. I could not mounted it accordingly in arrow direction due to tube overlap at the flanges both sides (catalyst and mating). The whole exhaust-pipe parts except exhaust manifold were ordered from ROCK-AUTO… not high end.
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It's a little difficult reading your post so could you please update your post with pictures? You're in Germany so your vehicle is setup differently from the U.S., and pics would help out quite a bit.

For example, this statement makes zero sense to me: " Just one of those was mounted against the marked arrow direction of flow bolted on the outside. "
 
It is actually an US-Import and there was no need to change anything concerning emission regulation. There are two catalysts and one - the rear one - has an arrow of flow direction marked on it. Like at stamp in form of an arrow.
 
so you're talking about the two cats. Got it. If you suspect a potential blocked exhaust path, why not just remove that whole section and go for a drive. It'll be loud but that'll answer your exhaust backpressure question.

Additionally, it'd be nice to see an actual fuel pressure reading by using a fuel pressure gauge. If you search here, you'll see how some of us are connecting a fuel pressure gauge to the fuel system. You need to see the fuel pressure under load in order to rule out the fuel system. Otherwise, you're simply guessing!
 
alia176 said:
so you're talking about the two cats. Got it. If you suspect a potential blocked exhaust path, why not just remove that whole section and go for a drive. It'll be loud but that'll answer your exhaust backpressure question.

Additionally, it'd be nice to see an actual fuel pressure reading by using a fuel pressure gauge. If you search here, you'll see how some of us are connecting a fuel pressure gauge to the fuel system. You need to see the fuel pressure under load in order to rule out the fuel system. Otherwise, you're simply guessing!
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You are right… guessing will not lead to the root cause as there too many options. Actually I did that… removed the catalysts and drove it. Still had that lack of power.
After all I will go on reading through the threads in here… found that:
Mir Balach

Thread 'Land Cruiser 1fz fe 1995 Power loss problem'

Hi guys My Land Cruiser 1995 1fz fe is having power loss issue when i go up hill or car gets hot normal temperature i press the throttle till 90% but night happens no missfire no jerk just car going with 10% power only when i let it cool its good for 10-20 mins only mechanics said me ect sensor I changed everything still my car is having issue

I changed ect sensor car was ok but after 3 days issue started again i changed sensor car was fine again issue i have changed everything but still issue i am mentioning what i changed

Fuel pump
Fuel filter
Injector
Plugs...
 
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Beast of Berlin said:
There is a lack of power currently with the 1FZ-FE. I have changed the fuel filter and it got better but not like before. I assume something else is clogging downstream…!? Has anyone made similar experiences with fuel filters or fuel tubes? Even took apart the whole exhaust-pipes having assumed that something broke in the catalysts and might clogged there – a piece of the inner structure has vagabonding was my guess. Just one of those was mounted against the marked arrow direction of flow bolted on the outside. But this was since years and had no effect on the power so far. I could not mounted it accordingly in arrow direction due to tube overlap at the flanges both sides (catalyst and mating). The whole exhaust-pipe parts except exhaust manifold were ordered from ROCK-AUTO… not high end.
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Did you order the ANSA exhaust? I ordered the front pipe and it had ANSA stickers but also it was stamped BRExhaust as well fitment was good the only thing I’d do differently would be to add better hanger bracing like is found on the stock exhaust but it’s easy to remove for future fortification.
 
There are no more label on it. Have to check the old packing slip... But as there has been a significant improval after the fuel filter has been changed I assume the failure is somewhere downstream to the tank...
 
Beast of Berlin said:
There are no more label on it. Have to check the old packing slip... But as there has been a significant improval after the fuel filter has been changed I assume the failure is somewhere downstream to the tank...
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Have you made sure your throttle position sensor is in spec and adjusted correctly also what year is the vehicle? Can you hook up a scan tool to see any engine data?
 
Vacuum leak test. It’s a no brainer and cost almost nothing to do. Rule out simple things before to dig deeper.
 
MissahPapaJ said:
Have you made sure your throttle position sensor is in spec and adjusted correctly also what year is the vehicle? Can you hook up a scan tool to see any engine data?
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It is excatly 30y old this month... there is OBD
 
MissahPapaJ said:
Said he replaced the pump I assume the sock too but who knows. But what kind of pump I’ve gotten bad aftermarket’s out of the box that’s for sure.
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just replaced the fuel filter
 
there are SO many things that could be contributing to a loss of power..

fuel side:
- filter
- pump (unlikely unless surging etc)
- fuel pressure regulator (pull off vacuum hose and check for fuel)
- dirty injectors resulting in sub optimal spray pattern and flow

ignition side:
- spark plugs
- ignition leads
- distributor (inc cap, rotor, ignition timing)
- ignition coil

Sensors:
- oxygen sensors (big one)
- air flow meter/maf/VAF
- TPS
- engine coolant temp sensor
- good solid earths

Download the FSM for your model, grab a multimer and start testing. Took me ages to finally get mine running right again after low power for almost 3 years.

Have you bridged E1 and TE1 to check for codes?
 
Beast of Berlin said:
just replaced the fuel filter
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Sooooooo…. I smoke weed and pretended I read something, my bad 😂. Also maybe change that pump and sock. I’d replace that on any vehicle I buy that’s new to me. Don’t know or care if it had been replaced I’m gonna do it anyways. Even if it dosent fix it, it removes a huge diagnostic hurdle.
 
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Beast of Berlin said:
There is a lack of power currently with the 1FZ-FE. I have changed the fuel filter and it got better but not like before. I assume something else is clogging downstream…!? Has anyone made similar experiences with fuel filters or fuel tubes? Even took apart the whole exhaust-pipes having assumed that something broke in the catalysts and might clogged there – a piece of the inner structure has vagabonding was my guess. Just one of those was mounted against the marked arrow direction of flow bolted on the outside. But this was since years and had no effect on the power so far. I could not mounted it accordingly in arrow direction due to tube overlap at the flanges both sides (catalyst and mating). The whole exhaust-pipe parts except exhaust manifold were ordered from ROCK-AUTO… not high end.
Click to expand...
Whats the back story to it? Did it all of the sudden lose power? How long has it been in your possession? How many miles....?
 
efjayatee said:
Whats the back story to it? Did it all of the sudden lose power? How long has it been in your possession? How many miles....?
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The failure occurred in a sudden from one ignition to another... started in the morning perfectly and then in the afternoon it failed. Could it barly move into my shed. Then I took apart the whole exhaust unit as it was leacking at all ends anyway. Tried to seal it up properly with new parts. Its now just one flange that has some leaks. Same time I had issues with a dripping steering knuckle, a bended stabilizer and as the vehicle was lifted I took the chance to change the fuel filter.
And actually the performance now is much much better than before but it did recover fully. I own it since May 2019 and never ever had this type of issue. Now 326k mls on the clock.
 
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