Tune Up

[MT-2500]

Originally Posted by paxfam1

wow, I dumped 1 1/4 quarts into that baby..............It seems like its shifting smoother......

One other thing im noticing is when I start it up it runs really rough for a few seconds then it idles perfect. On most vechiles I have noticed you start it and the rpms go up to like 2000 and then come back down. This is starting and rpms are at like 250 and then it goes up and smoothes out......What could this be?

Time to look at the dip stick.

[paxfam1]

Anyone got any ideas on the rough starts?????????



Thanks in advance!
paxfam

[MT-2500]

Originally Posted by paxfam1

Anyone got any ideas on the rough starts?????????



Thanks in advance!
paxfam

Mileage?
What all has been done on base tune up?
Came retard reading is how much - or + ?
Any check engine lights? Or codes setting?
Any K & N filters or after market stuff?

Fuel pressure readings are?

Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
Post back fuel pressure readings.

[paxfam1]

okay, was gonna do the fuel testing but decided to do the seafoam threw the pcv valve..........Best this that ever happened to the blazer, runs to smooth now and starts normal....I plan on running some more seafoam threw it during the next few weaks!!

[BlazerLT]

Don't use Fram oil filters.