What's up people? I've got a problem that i'm stumped on. I have an 02 cavy with the ecotec motor and manual tranny. My problem is my car runs fine from startup until it warms up to normal operating temp. After driving for a while i'll go to push the clutch in to come to a stop and the car will stall out on me. I'll go to restart it and vehicle cranks for about 10-15 seconds and eventually will start,but is very hesitant to turn over. Now i know it is common for timing issues. I just replaced the timing chain, tensioner and also had to replace one of the guides due to it being broken. I set everything how it should be with the crank timing mark at 5o'clock exhaust cam at 10 and intake at 2 and put everything back together. Car ran fine and had no problems. No skipping no cel nothing!! I did notice today that my oil level was extremely low and barely showing on the dipstick. Could that have anything to do with the stalling issue or not? Or could it be something like a tps,iac valve,crank sensor,map sensor etc.?? Or is it possible that it is something with the timing? And i should mention that even before i did the timing chain the idle would drop low when pushing clutch pedal in but would return to normal after about five seconds. I'm stuck on this one and need to fix this asap because it is the only car between my girlfriend and me. Any help on this would be greatly appreciated. Thanks...
As you know I've pretty much done the same thing to my car lately that you did, changed the timing components, my car ran fine for 1000 miles, then one night I started losing top end power. Then the next day it was hard to start and wouldn't go over 2000 rpm's. Then it got worse, was hard to start and wouldn't run very well. It turns out my cat is bad, probably from running rich while the timing was off. One thing I noticed on my car was if you opened the throttle wide open you could feel air coming out of the throttle body, I finally unbolted the exhaust from the manifold and my car ran fine. So I have a plugged cat and you are probably experiencing the same thing since we just had the same problems.
That would make sense, but my cars timing wasn't off before i replaced the timing components. It was just making the loud noise near the valve cover area. The fixed timing chain guide was broken in two places. And on top of that i just replaced my entire exhaust system about 2 weeks ago including the front pipe that has a new cat as part of it. I do have to do a oil pan gasket to it on saturday which is why my oil level is so low. Someone told me that by my oil being so low that if the motor isn't getting enough oil that as a safety feature it can shut down the fuel delivery to the motor. Do you think there's any truth behind that theory?? Or could i possibly have a bad sensor like the tps, iac or even a crank sensor? Also the manual said to disconnect the neg battery cable before doing the timing chain. I didn't. Do i need to do that in order for the computer to reset everything?
Well my timing was only off from a broken timing guide also. My engine was running rich from that, I assume that is why my cat plugged.
The oil being could possibly have that safety feature but you didn't have it low enough for the oil light to come on so I don't think that is your problem. I don't think our cars keep track of oil pressure, it just has a sensor to tell if it has pressure or it doesn't, so the oil light would have to be on for the computer to do anything and I think it shuts the injectors off completely.
From what I've read the Crank Position Sensor is also connected to the tach, so if the tach is reading correctly your CPS sensor should be good. Other than that you'll need a scan tool that shows the RPM reading.
When I changed my timing set I never unplugged the negative battery cable, the car just had a high idle for a couple minutes and the car recalibrated itself within that time. I don't think it is a necessity.
