YotaFun
09-19-2008, 03:38 PM
Here is a fun one for you all.
About a month ago, just before my trip to Florida on the last week of August(didn't drive the truck there just trying to give you a time perspective) Tess started to do something to me that seems very out of the ordinary for use 3.4l guys.
During cold start up, no matter what time of day it was whether it be early in the morning, late afternoon after sitting all day, or at night, about 30seconds to a min after start up I would start to get a nice engine rumble at idle.
Talking like a nice V8 idle that we all dream we could have with nice deep strokes that you could here with ever revolution of the pistons and you can feel as the whole vehicle vibrates from the power (something that 3.4l while being large enough is still no V8) and she would proceed to do this for the next 30 seconds or so before going back to high idle to warm up.
Interestingly enough, the RPM gauge does not budge the entire time when doing this and stays at a steady 1000-1200 range (can't really remember exactly at the moment if it was 1000 or 1200 but it was in that range.)
No CEL is being thrown either.
Today I was leaving work and was in a bit of a rush, so I started her, put her in gear, and went, got to the light and idled for about 15 seconds then it changed, let my foot off the gas and she started to do it, this time you could feel the engine was doing something since she jolted a little and still NO CHANGE on the RPM gauge and still no CEL.
I know I am do for an oil change but that never seemed to be a problem and this little symptom goes away after the 30 second period it does it.
I will tell you a little about the truck and then you all can help me go from there.
97 3.4l SR5 4WD Runner (for those who don't know)
135K+ on the OD
Auto Trans
The oil I am running is that Mobile One 0W-30 Full Synthetic Advance Fuel Formula.
Every oil change I clean out the TB and the MAF.
Every other oil change I run Seafom through the gas tank.
Every 4th oil change I run Seafoam through the gas tank and the TB
At the 130K interval the following was done:
Spark Plugs
Wires
Air Filter
Oil (switched to the 0W-30)
Oil Filter
Clean MAF, TB
Seafoam
That's about it.
What I thought it could possibly be was the fuel filter which is original (either from the factory or the previous owner playing around, some how the nut that attaches to the filter on the line heading to the engine got cross threaded making it difficult to change to a new filter, I need to re-tap the nut and get a new filter in...)
But since this only happens on a cold start up I ruled out the filter as a possibility.
So Gang?
Any thoughts?
About a month ago, just before my trip to Florida on the last week of August(didn't drive the truck there just trying to give you a time perspective) Tess started to do something to me that seems very out of the ordinary for use 3.4l guys.
During cold start up, no matter what time of day it was whether it be early in the morning, late afternoon after sitting all day, or at night, about 30seconds to a min after start up I would start to get a nice engine rumble at idle.
Talking like a nice V8 idle that we all dream we could have with nice deep strokes that you could here with ever revolution of the pistons and you can feel as the whole vehicle vibrates from the power (something that 3.4l while being large enough is still no V8) and she would proceed to do this for the next 30 seconds or so before going back to high idle to warm up.
Interestingly enough, the RPM gauge does not budge the entire time when doing this and stays at a steady 1000-1200 range (can't really remember exactly at the moment if it was 1000 or 1200 but it was in that range.)
No CEL is being thrown either.
Today I was leaving work and was in a bit of a rush, so I started her, put her in gear, and went, got to the light and idled for about 15 seconds then it changed, let my foot off the gas and she started to do it, this time you could feel the engine was doing something since she jolted a little and still NO CHANGE on the RPM gauge and still no CEL.
I know I am do for an oil change but that never seemed to be a problem and this little symptom goes away after the 30 second period it does it.
I will tell you a little about the truck and then you all can help me go from there.
97 3.4l SR5 4WD Runner (for those who don't know)
135K+ on the OD
Auto Trans
The oil I am running is that Mobile One 0W-30 Full Synthetic Advance Fuel Formula.
Every oil change I clean out the TB and the MAF.
Every other oil change I run Seafom through the gas tank.
Every 4th oil change I run Seafoam through the gas tank and the TB
At the 130K interval the following was done:
Spark Plugs
Wires
Air Filter
Oil (switched to the 0W-30)
Oil Filter
Clean MAF, TB
Seafoam
That's about it.
What I thought it could possibly be was the fuel filter which is original (either from the factory or the previous owner playing around, some how the nut that attaches to the filter on the line heading to the engine got cross threaded making it difficult to change to a new filter, I need to re-tap the nut and get a new filter in...)
But since this only happens on a cold start up I ruled out the filter as a possibility.
So Gang?
Any thoughts?