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Comments
If you haven't done or had any work done that required pulling the cable or gear, check and see if all the connections are tight.
Since this is an intermittent problem, it's most likely a broken cable. It could be the gear on the transmission, or the speedo itself.
I would take it to a speedo shop, there work is usually pretty reasonable for what they do.
Motor mount breakage is fairly common on these. That 4.3L can generate some pretty good torque. I have had to replace both on my two Blazers this year.
Have you checked for worn lower ball joints? You might do a search on "ball joints' in the Jimmy/Blazer topic and see what comes up. I have seen a lot of comments about these in the 4WD. The 2WD uses a different joint and doesn't have the same issue.
Also, is the vehicle in 2WD or 4WD at the time?If it's in 2WD, then the extra torque needed to go up hill is not being passed to the front drivetrain, so it's pretty unlikely that the front is the problem in that case.
Any further info?
I haven't pulled one of these apart to look at, but I know several here on the boards have.
And for P0300: http://www.obd-codes.com/p0300
I would first try troubleshooting according to P0134. If everything looked good, I would troubleshoot according to P0300.
The fuel pump grounds to the frame. I heard that sometimes the connection gets corroded and the fuel pump stops working.
He calls on the way home. Still ticking, CES light comes on. Calls later, CES light is now flashing. uh-oh. Gauges all normal, trip computer says fuel economy not so good. "Keep heading home. You'll either make it or you won't but the damage is done".
An hour later I am out in the garage and think my neighbor has pulled up with his diesel Dodge. Wrong. It's the kid, and the engine isn't ticking, it's banging pretty good. Crap.
Pulled the valve cover off and the #1 intake rocker is sitting at a 45d angle, bent, the push rod is bent and has been banging on the head. This is not looking good.
Pull the spark plug, no damage. Okay, good sign. I think it over and come to the decision that I will change the rocker and pushrod, leave the valve alone, (it has some interesting wear pattern where the rocker was catching it, sort of).
Change the parts, put it all back together, cross the fingers and turn the key. The little [non-permissible content removed] cut loose with one pants-wetting backfire, then idles smooth as glass without a single tick. Drove the car around a bit, never over 3K rpm as I am not pushing my luck, and it runs like a top. No tapping, ticking, or knocking.
After driving the beast all weekend without so much as a peep from the valve train, I send him back to school with the admonishment that he shouldn't drive it anywhere he wouldn't want to walk home from. He called last night to tell me it ran great, no noises, and fuel economy right back where it belongs. No SES light, everything status quo.
I wouldn't warranty that repair into next week, but I also can't think of anything that can be worse than what was. If this hadn't worked, the top of the engine would have been torn down and the head reworked. On a car this age, I would be doing the work myself or been approaching the point of diminishing returns real quick.
But sometimes God just decides you need a break.
Second, it sounds like you have a leaking CPI that could be flooding the cylinder when the engine is not running. There is a regulator and a "spider assembly" involved in the fuel injection system, and the leak could be coming from here.
port.The reason I'm asking is my blazer which i just did a tune up on runs AWSOME except for when I floor the gas it seems 2 stumble a little and seems to struggle gettin up to rpms.3/4 throttle it RIPS!This truck
does not smoke,burn oil or leak any fluids but it does have high mileage!
PS:If I start this truck and take off right away it the engine doesnt seem to wanna go .I have to let it warm for 20 seconds or so.What do you guys think?Has anyone else had this problem?Remember this truck runs very very good except when I floor it and even then its not terrible buts its not 100% either.PLEASE HELP!Thank you guy's very much!!!!!!!!!!!!!!!!!!!!!!!!!!
And yes, you do have multiport fuel injection. What you are seeing that looks like a throttle body injection is just the "air valve" to the engine. The injectors are not visible from the outside.
This is strange any ideas where to start? I though it was the wire harness going from the fire wall to the keyed switch so i changed that and it did not help.
Thanks
I think first thing I'd do is try another station to see if their scanner works. If not, you could have an issue with communicating with your car's PCM.
As for the high HCs, this is usually indicative of a misfire, which could be tune-up related, or a bad 02 sensor, just to name 2 things. Also could be a lean misfire, caused by vacuum leaks.
On another note, while I am doing the stater, am also considering installing new wires at the same time. What wires on the distributor go to which spark plugs? And where does the 7th wire go? The passengers side has 4, drivers side has 3 on the cap.