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Discussion Starter #1
Hello everyone, i have searched and read in the forums.
I am sorry as english is not my first language, it´s difficult to find answers to some things as i cannot describe them correct.
I have a X-90 1996 ID:JSAELB11S00102039

Car has been driven for a year, full service oil and filters also timing belt/tensioner.
Four days ago suddenly problem started.
Car lost power and i cannot find any reason why.

Engine seems to be in some kind of closed loop or failsafe mode.
When started idle is just around 6-800 rpm, earlier was up to at least 1500 then slowly dropping down to 800.
Engine revs up if very carefully pressing the gas, a fast motion then engine stalls.
Going down a flat road is possible, then when uphill the revs are going down and i have to downshift.

No sign of any damage to hoses and cables around engine.
Checked for blocked intake and exhaust, all ok.
Changed plugs to new, also distr.cap and rotor.
Lifted ign.cables one at the time, no change.
Diconnected airsensor(at filterhouse), engine did not start at all.

If anyone has a clue, or explored the same issues (hopefully solved them) please write and guide me on the way.
Göran
 

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Put a gauge on the exhaust, that is the way to verify the back pressure... >2 psi at 2000 rpm is a done deal, then you have to isolate the constriction CAT or muffler/resonator
 

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Discussion Starter #3
Hello, i short update as it´s quarter past one in the morning here.
I disconnected the exhaust at downpipe, also to inspect inlet of cat.
Its a german sold manual 5 speed car 4x4, cannot find a OBD anywere.

Thanks for response
 

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A restricted exhaust cannot be verified by just looking...

Remove the B1S1 and install a low pressure gauge, start the engine and monitor the recorded pressure..
 

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Just wondering, putting a pressure gauge on the exhaust sounds good
But, how do you tell if it is too high or if it is good?
Are there specs on exhaust pressure??

I see the op said the timing belt was changed along with the tensioner.
Is it possible a jumped belt or weak tensioner cause loss of power??
 

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Just wondering, putting a pressure gauge on the exhaust sounds good
But, how do you tell if it is too high or if it is good?
Are there specs on exhaust pressure??

I see the op said the timing belt was changed along with the tensioner.
Is it possible a jumped belt or weak tensioner cause loss of power??
As philip said earlier under 2 psi is good, over that indicates a blocked exhaust
 

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As philip said earlier under 2 psi is good, over that indicates a blocked exhaust
He said, "Put a gauge on the exhaust, that is the way to verify the back pressure... >2 psi at 2000 rpm is a done deal, then you have to isolate the constriction CAT or muffler/resonator "

I did not understand >2 psi is a done deal?
Sorry, still new to this.

Thank you

Would a clogged air filter have the same affect?? Low power??
Guess I should stop asking so many question and read more.
 

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If its greater than (>) 2 psi "done deal" means there is a restriction and the job proving it is finished, like concluding a sale. It's a slang term that real englidge speakers will understand hehe
 

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Perhaps, if you do not have a vacuum gauge, and easy way to check this is to remove your O2 sensor on the exhaust manifold. If your issues go away, and the car runs better now, it confirms you have an exhaust restriction. Removing the O2 sensor allows most of the exhaust gas to leave the engine through the O2 hole, rather than going through the exhaust.
 
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Discussion Starter #11
Hello again, to be clear of exhaust backpressure i ran the engine with just the downpipe connected.
The rest of ex.system was not connected.
Same behavior, just a bit louder .....
 

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Is your down pipe just a pipe or does it incorporate a precat ?

If you are sure it is a clear exhaust, time to re evaluate and look to checking the timing (engine, not ignition)
 

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Start with a compression test, warm, throttle wide open/fuel cut... I would be looking for >170 psi.

If you have a vacuum gauge connect to the main intake manifold and observe the needle action and value, post all results

97620
 

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Discussion Starter #15
Yes, compression test will be done tomorrow evening.
Beacuse i have my instrument at work.
Q: how to easy cut fuel distb ?

It was my daughter that was driving when it started.
She said it came at once, not off and on.
Timing will also be checked tomorrow.

As for electronic troublshooting.
I found another X-90 justl like this, going to ask if i could try his TPS as his camshaft bearings seems to be worn out.
So his car is just parked waiting for a replacement cylinderhead.
 

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First try with gas pedal to the floor, if it does not start that will cut fuel, if it starts you need to either pull the fuel pump fuse/relay or disconnect the injectors..
 

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Discussion Starter #17
And also, when ignintion turns on ,check engine lamp lights up then when engine starts it goes off again....
So the engine management circuit does not seem to feel any fault.
Well,additional testing will follow tomorrow evening.

Thanks for helping out so far.
 

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The engine management ECU will not detect low compression , not off spec valve timing..
 

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To cut fuel distribution when you are doing the compression test, just remove the F1 fuse. Remove all the spark plugs, have a well charged battery and floor the gas pedal for best compression. On a warm engine, your 16v engine should pull about 190 psi on all cylinders.
 

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Discussion Starter #20
Hi again, now compression is checked.
170psi on all cylinders(cold engine), it seems to be ok.
Family craved some attention so timing will be checked tomorrow.
It´s almost midnight here, time to sleep soon.

Thanks for the advises.
 
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