Quote:
Originally Posted by mpescatori Gemi, I need to understand just one (very important) thing:
- Is it your RPM reading that goes up and down?
OR
- is it your engine rpm "proper" that goes up and down?
If it is the RPM reading, it is a common fault to Italian Tata Safari owners, in 99% cases it is the voltage regulator on the alternator.
If it is the engine rpm that goes up and down (you can hear it with your own ears) then you should check the engine rotation sensor (often on the flywheel) it is a little light-reading diode that tells the ECU the effective engine rps. If the sensor is dirty (even just plain dusty/muddy) the whole engine will drive like "drunk"
Hope this helps |
The engine runs at higher and lower rpms. THis was solved by changing the throttle body. Which has the throttle position sensor and the stepper motor attached to it. IN the 1.6 we cant remove the sensors, its fixed to the throttle body. Quote:
Originally Posted by vinit.merchant I faced a similiar problem with my Santro. Though it doesn't have a Tacho, the problem was similiar. It lasted for around 4-5 months, during which some mechanincs mentioned that Coolant needs to be changed and some more optimisteic Mechanics offered an Engine Down. I changed the Coolant which dint work and the problem continued. I just ignored the Engine Down problem, as I was sure the engines was working very well.
Strangely, the car was getting stalled sooner with AC on than without AC.
Then, on a trip to Kolhapur, a mechanic cracked the problem perfectly. The problem was of the Electronic fuel pump which required replacement.
I replaced it and there aint any problems after that. it is 3 months now.
I suggest you get your Fuel pump checked once, if thats not yet done. |
Well the fuel pump was next in line if the issues could not be solved. Quote:
Originally Posted by Jaggu Whats the update?
Ive been thinking about this, if you have ruled out throttle body sensors then you should check for any air leaks, while the car is really hot (as in bumper to bumper traffic).
Also is there any fuel vapor collector, if so is it clean (tubes that go in, as well as the pores which let it breath). This one is a high probability since it might be residing near your fuel tank, which will get clogged with all the road muck.
How about injectors? are they perfect? One clogged injector gave similar results in my old car. |
Thanks Jaggu. We changed the fuel collector too but without any effect.
We changed the following parts last week
- ALternator
- Catalytic COnverter
- LAmbda Sensor
Since then the car is running fine. Hope it stays fit and good here on.
Still not very sure what the real culprit was. Changed everything in line since dd not what to re open things every now and then.
The logic for changing the parts were
- Alternator not giving enough current at lower rpms. Hence ECU could be increasing rpm. to stabilise current.
- Catalytic converter being blocked or malfunctioning could lead to higher idling. THought this could be the culprit since the issue cropped up mostly when outer temperature was higher. Mostly in afternoons.
- Lambda Sensor could lead to faulty air mixture and high idling.
Personally i suspect the lambda sensor. But the behaviour only in bumper to bumper traffic keeps me doubting.
Anyways the car has run perfectly over the last week. Thought if being sure before posting.
Last edited by gemithomas : 28th April 2008 at 22:33.
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