Rough engine when cold out.
#1
Rough engine when cold out.
Hello to all.... Since its been cold, I have to warm my car up for 30 mins or so. If I dont warm the car up it runs kinda rough and I can kind of hear what I believe to be valve tap or something. I dont think that i have an exhaust leak, as the back side of the engine (firewall side) sounds kind of noisey until engine is really warmed up. Anyone else experience this? Could it be exhaust manifold, valve cover ect.... ??? It does feel like the car lacks some power until car really warms up. Car has 138,000 miles.. The colder it is out the worse it seems.... Any ideas???? Thanks BTW, if its 50 degrees or more out car doesnt seem to have a problem.
#6
Seems rough unless I let it run for 30mins. Maybe I have a leak at the manifold because the noise seems to come from down low in the engine until warmed up. Hard to explain, dont have a camera handy...
#7
Bad ECT sensor?
Is your service light on? You could have a bad ECT sensor. If the ECT sensor is bad, the PCM will take readings from the O2 sensors, which won't give proper readings until warmed up. When the engine (and O2 sensors) is cold, the PCM will take readings from the ECT until the O2 sensors are warmed. If your engine light isn't on I would suggest using a lower-weight synthetic oil like a 0w-30.
#9
#10
Is your service light on? You could have a bad ECT sensor. If the ECT sensor is bad, the PCM will take readings from the O2 sensors, which won't give proper readings until warmed up. When the engine (and O2 sensors) is cold, the PCM will take readings from the ECT until the O2 sensors are warmed. If your engine light isn't on I would suggest using a lower-weight synthetic oil like a 0w-30.
#11
Hello to all.... Since its been cold, I have to warm my car up for 30 mins or so. If I dont warm the car up it runs kinda rough and I can kind of hear what I believe to be valve tap or something. I dont think that i have an exhaust leak, as the back side of the engine (firewall side) sounds kind of noisey until engine is really warmed up. Anyone else experience this? Could it be exhaust manifold, valve cover ect.... ??? It does feel like the car lacks some power until car really warms up. Car has 138,000 miles.. The colder it is out the worse it seems.... Any ideas???? Thanks BTW, if its 50 degrees or more out car doesnt seem to have a problem.
I'd start with the basics if these have not been done yet. Replace Fuel Filter, Air Filter, Check for fouled plugs, clean Mas air meter. 30 minutes for a warm up is a long time. Your oil has nothing to do with it. IMO.
#12
Thanks, i'll have to check into the MAF and fuel filter. Plugs were changed 2wks ago. Not today its warm out here in NJ and car is running smooth. It really seems like I have to let the car warm up to normal operating temp for the engine to feel really smooth.. I can still hear a slight valve tap or something as well until the car is warmed up. I dont beat on the car, rarely any jack rabbit starts ect. BTW its an auto...
#13
DO NOT use a 0 weight oil your engine would hate that. Oil would have nothing to do with this guys. Once your car is warmed up? with a 0 weight oil your lubrication is going to go be to low for our engines. A 5w oil is plenty good enough unless you live in northern Canada and the oil isn't your problem to begin with anyways. 5w is the lowest rating nissan recommends. Your having a rough idle? Or it revs other than it should? With a rough idle especially in the winter it helps for your MAF(which is probably your problem) your IACV and your throttle body to be nice and clean. Get some MAF cleaner and throttle body cleaner and go to town. If that doesnt fix it, replace your MAF.
#14
DO NOT use a 0 weight oil your engine would hate that. Oil would have nothing to do with this guys. Once your car is warmed up? with a 0 weight oil your lubrication is going to go be to low for our engines. A 5w oil is plenty good enough unless you live in northern Canada and the oil isn't your problem to begin with anyways. 5w is the lowest rating nissan recommends. Your having a rough idle? Or it revs other than it should? With a rough idle especially in the winter it helps for your MAF(which is probably your problem) your IACV and your throttle body to be nice and clean. Get some MAF cleaner and throttle body cleaner and go to town. If that doesnt fix it, replace your MAF.
#15
DO NOT use a 0 weight oil your engine would hate that. Oil would have nothing to do with this guys. Once your car is warmed up? with a 0 weight oil your lubrication is going to go be to low for our engines. A 5w oil is plenty good enough unless you live in northern Canada and the oil isn't your problem to begin with anyways. 5w is the lowest rating nissan recommends. Your having a rough idle? Or it revs other than it should? With a rough idle especially in the winter it helps for your MAF(which is probably your problem) your IACV and your throttle body to be nice and clean. Get some MAF cleaner and throttle body cleaner and go to town. If that doesnt fix it, replace your MAF.
#17
#18
"my 09 comes from the factory...." no it doesnt lol your car, which you should know this, comes with 5w-30 ester oil from the factory. and a timing chain rattle has nothing at all to do with oil weight either. Good lord quit posting misinformation on these forums, if you dont know the right answer then dont post anything at all
Last edited by ShocknAwe; 01-07-2012 at 11:14 AM.
#19
"my 09 comes from the factory...." no it doesnt lol your car, which you should know this, comes with 5w-30 ester oil from the factory. and a timing chain rattle has nothing at all to do with oil weight either. Good lord quit posting misinformation on these forums, if you dont know the right answer then dont post anything at all
Last edited by cjandura; 01-08-2012 at 10:28 AM.
Thread
Thread Starter
Forum
Replies
Last Post
sctludwig
3rd Generation Maxima (1989-1994)
8
09-01-2022 01:32 PM
6spd4dsc
5th Generation Classifieds (2000-2003)
4
03-04-2016 05:19 PM
Maxima30
5th Generation Maxima (2000-2003)
2
09-07-2015 06:13 PM