Technical urgent help!!! power loss in HGT

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Technical urgent help!!! power loss in HGT

siniper

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I have a 1998 mk1 bravo hgt and have been using it from 98. The problem is sudden loss of power. It is a 147 hp (108kw) car but when tested in the dynamometer the result is 100hp. Now, the car is in 116087 kms. In 90570 kms cambelt and clutch plate were changed at a authorised dealer of fıat and there is no problem with this operation. However, we opened cylinder head cover and check the work done by the dealer by locking the camshaft at the peak with its original tools. One for the induction and the other for the manifold. The camshaft and crankshaft belt sprockets are in the same relative positions. The result is everything seems ok. Secondly, we made a carbon clean and after this we cleaned the injectors with ultrasound machine thinking that the injectors will be stuffed but there is again no progress. Thirdly, we changed the fluxmeter which is located between the air filter box and butterfly valve. The result is the same there is no change. After these we took off catalytic converter if its life time was over but the result is same. At the same time we changed the ECU with a brand new one but again the same result. Besides, we all changed spark plugs, oil, oil filter , air filter and fuel filter with new ones. We also looked the pressure of the fuel pump, the pressure is ok. Car is checked with examiner in the authorised dealer but there is no error code and all the emission values are so normal. We did not change lambda sensor because the staff at the dealer said that if there is a problem with that sensor the examiner gives error code. Some people said there will be problem in the MAP sensor. If so, can a MAP sensor cuts 1/3 power of a car? Some said that clean the EGR valve. Is there a EGR valve in Bravo HGT? If there is, where is its location? My engine is in a good condition and there is no need for a major rebuilt (the dealer said that). The loss can not be caused from the condition of the engine. In my opinion, I have a sensor problem but which sensor is faulty? Can it be an electric problem? I need a urgent help asap. If I can not solve the problem I am going to sell my car because there is no driving pleasure for me after this problem.
Note: This problem does not begin after the cambelt change but we also checked work done by the authorised dealer.
Can anyone help me ???????
:bang:
 
hi, I forgot to write compression tests while I was writing my problem. Both tests are done. Only one thing is indefinite as you say MAP sensor.
Thanks. see you
 
Do you mean MAP by MAF sensor. I think maf sensor in only for diesel engines. I mean by map sensor: manifold absolute pressure sensor
thanks
 
the 147 has a MAF not a MAP. it can easily cause powerloss, especially at higher rpm (3500+). spray the hot film in the MAF with contact cleaner and you should notice a huge difference. this needs to be done at every service. if you have not done it before then the MAF will be very dirty so 100hp is not a surprise. a dirty MAF does not show up on an examiner diagnostic. cleaning the MAF made a huge difference on my car, it became much faster.
 
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urgent help...power loss in hgt!!! part2

hi everyone,
today I changed the maf sensor with a brand new one together with the others as I mentioned before.I bought it from the authorised dealer and costed me so much but there is no difference on my car.
what can I do is there anything left? I am so much confused.
I am waiting for other comments
help help help
thanks:bang:
 
Re: urgent help...power loss in hgt!!! part2

it is in the forum and the title is the same and the sender is same also
 
Re: urgent help...power loss in hgt!!! part2

Then why not continue on from there, its a logical course, if you want help, I got it all combined so it makes sense and so we can help. (y)

I didnt know what your initial problems were. Did you try cleaning the MAF before splashing out on an expensive electrical part.

What were the results of the compression test? When i did mine they were all around the 200psi mark on all 5 cylinders.

What is the power loss based on the RR results only, or driving experience from before/after? 0-60 8sec, power band is high up the rev range.
 
Re: urgent help...power loss in hgt!!! part2

hi mountainmachine,
As I mentioned before my problem is power loss.Before changing the maf we cleaned it but there was no change in the conditions.After that change we again changed the maf with another brand new one.Because we thought that maybe it will be a faulty one even though it is brand new.The loss not only based on RR results but also based on driving experience. A 1600cc car can beat my car although I was driving my at last limits (7200-7500rpms).At the compression test all of the 5 cylinders mark about 200psi as yours. Everything seems ok upto 3rd gear.At the 3rd gear it goes about 130 kms and the rev is 7000-7200rpms.However, in the 4th and 5th gear its acceleration becomes so much slowly and its final speed becomes 200-210 when the gas pedal depressed fully.On the dynamometer it completes the test in 22 seconds.I think the time is so bad. isn't it ?
thanks a lot
 
Re: urgent help...power loss in hgt!!! part2

4th gear in mine is decent for acceleration (obviously not as quick as 3rd but still decent and pref to the following), also at those rpm you'd be bouncing of the rev limiter, remember at those rpm your not in the peak power band. 22 sec from 0-124mph? That doesnt seem too bad, as thats under 3 times the 0-60 speed, as you obviously loose acceleration the higher speed you go as you start to have other forces playing a bigger part. I dont have aything to compare that too I'm sure someone here will.

Also which 1.6 couldnt you keep up with? Remember some small engined cars like starjets etc have amazing power to weight ratio's and turbos to boot.

Could the clutch plate be sticking? Sapping some of your power? ie the opposite from slip. Or could your gearbox be on its way out so your loosing power via the ratios.
 
Re: urgent help...power loss in hgt!!! part2

hi mountainmachine,
the car is 1.6 wolksvagen fsi 105hp. Yes 0-124kms in 22 seconds but not 0-124mph as you wrote. The clutch plate and cambelt were changed at 90570 and the car is in 116087kms and the clutch pedal is very soft there is nothing unusual for me.Besides, the fuel consumption is normal. But it makes a smell like dead animal in the higher revs. Can it be the cause?
Can we find the problem if we take of the engine and open it. Examine all the parts. If we can’t find anything it will cost me too much.Can it be a faulty sensor? Or a sensor can cause this problem which tricks examiner?
thanks
 
Re: urgent help...power loss in hgt!!! part2

Sorry i thought you meant 0-220kmph in 22 sec. 0-124km is bad... almost double what i'd expect. Must be something majorly wrong. Replacement engines etc arent too expensive over here, dont know about with you.

To be honest with that kind of issue i have no idea what'd be sapping that much power.

You read my thing about the rev limiter?
 
Re: urgent help...power loss in hgt!!! part2

yes I read and I will pay attention to your advices about rev limiter.
I have one more question.Is it necessary resetting the ECU after the maf change?
If so how can I do?
 
i think my 1.8 bravo had approx 40psi at idle, which is under 3bar. maybe your fuel pressure regulator is faulty causing overfueling. i would check to see what the operating pressure should be on your model.
 
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