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Old 09-10-2011, 03:34 PM   #1 (permalink)
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Default 95 Tracker 16V blue smoke, ECM sees cold

Well, my Tracker is showing blueish exhaust all the time , high oil consumption, the engine temp indicator on the middle of dial but decreases as accelerating ; checked with Tech 1 and the ECM sees the engine temp not more than 68 Celsius but, by IR gauge, the temp is close to 80 deg.; checked temp sensor, ok ;
I have changed the piston rings about 2 years ago but not the valve seals ; I am wondering what is causing this smoke on exhaust, in order to get ready with parts required for the upcoming repair. I will consider also opening up the ECM to see the condensers. Any idea about this smoke ?
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Old 09-10-2011, 03:53 PM   #2 (permalink)
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One more thing ( I feel it can be related to this issue ) : Oil leaks over the filter seal when over 3000rpm ; thinking the PRV on pump is stuck closed / pressure too high / flooding the valves top and entering combustion chamber through the guides. The PCV system is all fine. Is this a might ?
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Old 09-10-2011, 04:04 PM   #3 (permalink)
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Sorry, must convert this out of metric - your ECU sees temp at 154F (68C) but actual temp taken with IR gun (and where did you take the temp? Thermostat?) shows 176F (80C). How have you checked your coolant sensor? This sensor advises the ECU what the temperature is, depending upon the voltage it is sending to the ECU. Check the wiring on this sensor, to make sure that it is connected securely. Your temperature gauge on the dash is really not an indication of anything - it is a linear gauge that is only of interest if it starts doing something new (that is going higher than it usually does, etc.) When gauge drops down, it is probably showing that the thermostat has opened.
Your smoke is possibly caused by pcv valve, valve seals or piston rings. You should probably run a compression test and a leak down test.
Is your check engine light on with the key in the on position, and off when the car is running? Does the CEL give you a code 12? And where on earth did you ever find a Tech 1 scanner???
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Old 09-10-2011, 04:28 PM   #4 (permalink)
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Thank you, Bex !
Coolant sensor checked as per its temp / resistance table, found OK ; course, its connector also checked but not the wiring to ECM ( yet !) All grounds already checked. ECM is still in closed loop.
Temp gauge on the dash - felt strange as it follows the accelerator pedal strokes ! It is not having a gradual / slow drop down to consider it is caused by thermostat opening. I feel it is got something on the electrics, being hooked onto alternator's circuit.
Compression / leak down tests all passed ok.
CEL is operational, code 12 ok.
Regarding Tech 1A ... course, bought it from the States, years ago, as per my previous posts ; costed much but I don't see any problem in spending with this car ; I am about to buy a Kent Moore tool set ( complete ) for it, just now ! Even spending 175$ shipping , without saying about the extra 40% with customs taxes !
Doesn't matter the costs, I want this car RUNNING. But I don't want to pay anyone for a s...ty job so I preffer to DIY as much as time allows me this.
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Old 09-10-2011, 04:59 PM   #5 (permalink)
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What do you mean that the temperature gauge goes according to the gas pedal? You push down on the pedal, the gauge needle goes up, let off the gas and the gauge goes down? Like that? The gas pedal is not electrically connected to anything. Are you sure that the pedal itself or throttle cable is not affecting the harness? The black/white wire that goes to the coolant temp gauge comes from the ignition-coil meter fuse, which also connects to the alternator as well as a host of other things (main relay, fuel pump relay, oxy sensor, ignition coil, noise suppressor, etc.) through a number of splices and connectors.
What kind of oil are you using in the car? Normally, any blue smoke is caused by oil being burned with your gas, so it must be getting in there through some seal, o-ring, etc.
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'97 Suzuki Vitara 8v, 1.6L 5 sp, 4wd, 2dr, tintop, horribly purple
'61 NSU Quickly - 150mpg
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Old 09-10-2011, 05:09 PM   #6 (permalink)
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Pushing down the pedal ( engine revs up) and temp gauge goes down from mid- to cold. I am sure it is related to alternator output as it increases with engine speed. No other gauges doing like this.
Oil used Texaco 15W40 so I cannot go for thicker.
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Old 09-10-2011, 05:42 PM   #7 (permalink)
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The temperature gauge needle goes up or down according to the voltage that goes through it. The temperature sending unit is a thermistor that increases or decreases resistance according to the temperature it feels. The warmer the engine, the less resistance so more voltage going to the temperature gauge, raising the needle. Your theory is that when you increase revs, you are decreasing the amount of voltage to the temperature gauge, (or increasing the resistance at the water temperature sending unit), so that the needle will drop. However, when you increase revs, you are actually increasing the voltage of the alternator, so I can't see how this can be an electrical issue based on alternator output. It should be the other way around, no??
When you are idling in the driveway, before the car has reached running temp (say the needle has only just started to move, or is only at 1/4) and you rev the car, does the needle immediately drop then, too??
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Old 09-10-2011, 08:10 PM   #8 (permalink)
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Yes, it should be the other way around ; it seems strange to me for the gauge to react this way to increasing engine speed, especially that it wasn't doing this way before. It is a sign of malfunction for me and I will investigate this further ; for the moment I can live with it if it would be just that ; I only think this is part of the "concert" that gets that excessive exhaust smoke symptom - the issue I have to sort out ASAP.
Regarding the question with idling cold, in the driveway - I haven't done this check yet.
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Old 09-11-2011, 05:15 AM   #9 (permalink)
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Have you checked with your IR gun, the temperature when you are revving up the engine, to see if it REALLY goes down (as opposed to an electrical malfunction). For example, the clutch on the radiator fan which normally rotates at the same speed as the coolant pump shaft, is supposed slip when the pump shaft exceeds 4,000 rpm, so that the fan is independent of the shaft, and only revving at 3100 rpm. If the clutch is not working properly the fan would rev higher, knocking down the coolant temperature. IMHO, I am not sure that this is an electrical problem.
What is more important, of course, is the oil that is burning with your fuel causing the blue smoke. You advise that the oil leaks over the oil filter seal when revving over 3000 rpm?? Have you checked your oil pressure?
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'97 Suzuki Vitara 8v, 1.6L 5 sp, 4wd, 2dr, tintop, horribly purple
'61 NSU Quickly - 150mpg
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Old 09-11-2011, 01:15 PM   #10 (permalink)
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Quote:
Originally Posted by luigi daniel View Post
Well, my Tracker is showing blueish exhaust all the time (you mean black right smells of fuel unburned,right) , high oil consumption, ( is it on the ground,dripping onto....?)
is 3speed (is it 3sp) vacuum modulator leaking ATF, and motor stucking it in?



the engine temp indicator on the middle of dial but decreases BAD as accelerating ; checked with Tech 1 and the ECM sees the engine temp not more than 68 Celsius but, by IR gauge, the temp is close to 80 deg.; checked temp sensor, ok ;
one is lying. you do know there is a TSB on the motor right for the stat.
right? see my over heat page. "wrong thermostat gasket"
is ohms on ECT 300 hot? my guess it COOLING is changing temps. BAD.

I have changed the piston rings about 2 years ago but not the valve seals ; I am wondering what is causing this smoke on exhaust, in order to get ready with parts required for the upcoming repair. I will consider also opening up the ECM to see the condensers. Any idea about this smoke ?
i cant see the smoke?, so can tell true color, nor smell it.
oil burns white Put some in a pan and burn it.
fuel that is rich as pig, is BLACK,and stinks of raw unburned fuel.
blue tells me nothing , half thank blue is oil, other fuel.
use white smoke or black fuel, way less confusing to non viewers.
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