Sc 400 smoking , runs funny on low revs

check fuel pressure possible fuel pump issue

Just the other day, I finally received the answer to this problem with my '06 Rainier CXL. The front gear pack (in mine) needs to be replaced. Vehicle is driving AWD, all the time. Expensive repair- $1600. Mine has 93+K miles, the engine is in awesome condition. To repair or not to repair... that is my struggle.

Low battery charge, Battery Defective(Could have a bad cell), Loose or missing alternator drive belt, Faulty Alternator, Open or short system voltage circuit

fully charge battery and make sure everything switched off i.e rear window demist etc and take it for a run to get it up to tempature then park up rev engine at fast idle approx 2750 rpm for 180 seconds then take foot off throttle and allow to idle for 30 seconds this will clear your catalyst and get it up to the 600 degrees needed for it to operate properly this should remove the engine warning light

Hi
White smoke is usually a good sign of un-burnt diesel so reading your post and all the things you have already changed ie the glow plugs I would have the injectors tested to make sure they are atomising properly as it sounds to me like when your car isn't under load ie at low revs you have a cylinder that isn't firing correctly
Hope this helps Nick

Sounds like possibly a blown head gasket- that would explain the white smoke (usually an indication that coolant is being burned). . Do you mean the exhaust pipes sounded funny like drowning? If coolant is getting into the cylinders and being burned, some will not burn and get pushed in to the exhaust...
Pull the sparkplugs out and check for evidence of water or coolant. A compression test will verify if the head gasket is good or not.
Good luck.

po400 is=egr valve system, exhaust flow malfuncion. Hope this helps. God-Bless!

Scott,
I as well have a 2002 chev blazer 4x4 4.3L, and though I have not exerrienced your paticular problem, I have experienced Service Engine Light on, and generaly I have found it is one of your sensors.
You could have a bad sensor causing your rev problem. What I do is determine if the vehicle still runs as if the service engine light has not come on.
If it runs the same, in my experience it is not as crucial as if you have a performance issue, as you do with reving. If I was you I would try to get to your mech ASAP.
I am not aa mech but, I know our chev blazer very well, and how it should perform.
Hope this helps,
Chuck

i've got trafic 100dci 2001 year-had poor exceleration upto 2000 revs then turbo cut in,also at speed-mainly uphill the power would start to pulse(like small jerks forward)until it ran out of steam-80ish,changed egr valve-didn't fix it! then tested air flow meter and found figures incorrect,so replaced,also tested the tubo rod(down the back of the engine -visible with air filter housing removed)this was very stiff,so used wd40 to clean then spray oil to lube and worked the rod backward and forward until it moved freely.put all back together and that was it-back to normal-hooray!! have to point out that the van will not rev past 3700 revs when it is loaded-it has a load sensor,unloaded or partly loaded it will rev to I think about 4100 revs(don't quote me on that though) do hope this will help whoever and God bless

I would either go to a shop or buy a Infrared Thermometer and check the temp of the radiator and the upper radiator housing temp, that's a nice car and expensive to repair, but to blow the engine it would be worth nothing