So I have a 2003 forester xt 2.0 ej205 engine my engine cuts off at 3500 4000 rpm in neutral and all gears also I smell a lot off unburned fuel and lots off black smoke from the exhaust ecu has no code.
I changed sparks fuel filter I make a smoke test to check for leaks all is fine. Also the car boost only at 0.4 0.5 bar in all gears. Will attach a video on YouTube if this can help

 

does the speedo work or any other issues as that sounds like "safe" mode ??

 

Yes the Speedo works I took the car to 3 mechanics nobody can figure this out also I don't think is boost cutt off because I only hit 0.4 0.5 bar boost

 

is there any fault light / EML showing??
any codes at all?

 

NO fault light also no codes also I bypass the boost controller just to check but. Nothing changes

 

sounds more like a mechanical issue in that case........have you checked for compression??

 

Ok guys so this morning new simptom baterry light and hand brake light flash when I accelerate

 

Bad earth somewhere ?

 

I've check all ground wire all are fine

 

I've changed almost everything now since I have a spare engine MAF, crank sensor knock sensor camshaft sensor. I change wastegate bypass boost control bypass blowoff valve. Change sparks coils lol nothing change tomorrow I will read fuel trim on diagnostic an do a compression testI've done smoke test vacuum leak I don't know what else to do 😂

 

I think really with this you need a scope: Back probe from injectors and coils to see what's going on...are coils losing power (hard cut, and unburnt fuel)? Are injectors being held fully open (soft cut and black smoke)?

Then check cam and crank sensor pattens at the ECU end.

As a basic guess I'm guessing you either have a bad earth somewhere or a high resistance on the wire that supplies power to the coils..so it can provide voltage/current at low engine speeds but can't provide enough to supply the coils at higher speeds. Excessive interference on cam/crank wires could be a possibility, but I'd expect Cam/crank sensor codes to be logged.

This guy in the following link had an issue where his ECU would just shut down at high engine speeds, then cut back in as it slows (photobucket killed the video )...that was down to a bad earth on the engine: https://www.scoobynet.com/881965-lar...6000rpm-2.html

 

THanks for the reply unfortunately here in Cyprus mechanics have no ideas to work on this cars I checked all earth wires change the coils today and sparks but nothing changes I will upload a video on YouTube so you can see how is cutting the power.
untill now I change crank sensor camshaft sensors, bypass boost controller bypass blowoff valve made a smoke test vacuum leak check alternator. Now I have to make a compression test and waiting for new oxygen sensor just to check but I've changed the oxygen before 2 months

 

Was it a genuine O2 sensor. but like others have said bad ground, even if you have checked they are tight have a look to see if the contacts are clean.

 

I've check all the connections. Somebody says today it may be the speed sensor but if this goes bad will not trow a code ?

 

Thats what Alyn was checking I think when he asked if your speedo was working. If it is then can't see the speed sensor being the issue because you're getting a speed reading.

 

Yes Speedo is working the car drive just fine but I can't pass 4k rpm if I fully accelerate if I press slowly on pedal I can go to 5.5000rpm

 

Is that on wide open throttle it cuts out. Can't see it mentioned that you have tested it but I would hazard a guess at fuel pump.

 

I've checked the fuel pump pressure is ok
On wide open throttle it cuts out

 

https://streamable.com/gwc4p9 here is a video off the problem is making

 

Sounds like it's sucking in air.
sounds like blow off valve noise.

 

Rev counter looks like flicks back and forth quicker than the engine could possibly speed up or slow down. Hopefully this provides a clue? If rev counter is driven by ecu it could be sensor, ground or vcc supply? Just thinking if it's ignition or fuel related you'd not get the rev counter flickering around?

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I don't think this car have a rev counter sensor from what I know is a combination off crank sensor cam sensor that give signal to ECU and to tachometer not really sure how it works. Since I can't find something relevant online. Before 2 days I also check the car timing all fine I'm out off ideas what to check next 😂 I've also swamped another fuel pump and alternator just to be sure is not that I've ordered 2 new camshaft position sensor but don't think they are bad since I have no code. Is getting expensive this problem 😂

 

So guys here is another video the problem is worst after a long cruise on highway if I drive for 150 200km almost will not past 3000rpm I will attach link for video to see
https://streamable.com/f7k65a

 

Had a fresh import here a while ago some little Japanese fella had fitted toys as they do. Everything was working but threw a cel for vss.
Turns out they had spliced into the loom between the clocks and the ecu and when removing the said toys never bothered reconnecting the wires.
Check your vss at the ecu even if your clocks are working.

 

I have this car for 12 years now so no toys are fitted or ever fitted only thing is a boost gauge and air box and removed cat. But I will replace the vss just to be safe

 

Don't do that yet get a scope and check the signal into the ecu pinout first it could be a bad connection from the clocks to the ecu.

 

Somebody suggested that the vss may be also connected to the rpm counter i don't know what to say but my speed is showing bang on I measure with my texa diagnostic. Also somebody says it may be the pill on the hose to the brake booster but I bypass that today and nothing changed lol I tried everything 😂

 

As my last post.

 

Ok so now after 1hour off highway drive when I get in city driving slowly the car stop all lights was light on the dash and the engine died while in gear. I come to a stop turn off ignition car start again after few minutes died again while driving engine stop I had to stop wait a few seconds and then start again

 

Ahh if all the lights are on you can grab the error code and moves things along.