305 Issues, need your help

[Irish_Alley]

there aint nothing wrong with the Quad. if you want to replace it you can buy a new one or just rebuild your old one for under $30. the cat wont make any noises, will get hot, might glow, might smell like rotten eggs, top speed might be limited and loss of power. one way to test them is take out the O2 sensor before the cat or open the pipe up before the cat somehow or even just cutting it, if it runs better the cat is your problem if not you should look at fuel. just want to make sure but you did replace the fuel filter in the carb inlet right? there might be more than one also

[Jeff86inMS]

OK, here's the deal.  Not sure if witch craft is involved, or the earth has adjusted its axis, or planets that never align have aligned.....but I got it to the local shop Tuesday evening, waited to call them until yesterday noon.  They said they "can't find anything wrong with it, drives fine".  WTH???  I am dumbfounded!  I even drove my wife around in it to prove what I was saying so she wouldn't think I was crazy.  When I drove up to the shop on Tuesday, it took me 2 miles to get up to 45 mph.  When I picked it up yesterday, they were right, it drove better than it ever has since I've owned it.  Only thing I can figure is that there was some sort of trash in the fuel line that broke loose, I don't have a clue, but I'm not gonna look a gift horse in the mouth.  If it does it again, I'll take it back of course.  That being said, there is nothing to report as far as a fix.  I almost wish they would have found something to fix.  At least that way I wouldn't have to wonder.  BTW, no charge at the shop.

Guy's I truly appreciate the advice and responces from you fine folks!  Proves America still has the greatest folks in the world, that take time to "help their fellow man".

Regards,
Jeff

[greasemonkey54]

when my ESC went bad it would act up whenever it wanted to. Good luck and hope she stays good for you

[Fairlane514]

Makes sure your advance weights in the distributor aren't stuck.  Sounds like the motor won't rev.

[Jeff86inMS]

I'll check the weights to make sure everything is moving freely.  Thanks Fairlane514!

[Boone83K10]

Thanks Boone!  Yes, I still have the converter on the exhaust system.  Would the converter make any noise if it was clogged (rattle or something)?  Haven't heard anything.  As I said previously, the vacuum lines are trash and I agree with you, they all need to be changed out.  What about the "shaped" rigid plastic lines?  Are they available in a catalog somewhere?  Have had a couple of those break at the rubber fittings and had enough slack to reconnect them.  Do they make a "Vacuum Line kit" for a 305 that has all the sizes/lengths or do you just buy them separately?  I'll check around.

I changed all of the filters including the fuel filter at the carb inlet as well.

It would not rattle...

Not sure about the hard lines, but I assume using rubber replacement won't hurt them....I mean I would replace them without thinking about it.

[Jeff86inMS]

Can anyone tell me what the sensor threaded into the rear of the intake manifold is on my 305 is?  I have an "H" code VIN number.  It almost looks like an Oxygen sensor, but thought that would be down on the exhaust.  I noticed it the other day during my tinkering.  It's on top of the intake, screwed directly into the intake right behind the carburetor.  It has a wire coming out of the top. Any clue??

[Boone83K10]

most ports directly behind the carb are for manifold vacuum.


so maybe a MAP (manifold absolute pressure) sensor?

[bd]

Can anyone tell me what the sensor threaded into the rear of the intake manifold is on my 305 is?  I have an "H" code VIN number.  It almost looks like an Oxygen sensor, but thought that would be down on the exhaust.  I noticed it the other day during my tinkering.  It's on top of the intake, screwed directly into the intake right behind the carburetor.  It has a wire coming out of the top. Any clue??

That's an odd location for a truck engine sensor.  Can you post a pic?

[Irish_Alley]

the only sensor i can think of behind the carb is the oil pressure switch and it does have one wire if you have a gauge

[Jeff86inMS]

Sure, I'll take a pic this afternoon if it's not raining too hard, got this tropical storm Karen coming my way, so it may be raining this afternoon, not sure.  I'll do my best.  The reason why I ask is that when I was doing my tune up recently, the sensor looked like it was threaded in crooked into the manifold, and was gonna fix it.  I thought it might be an O2 sensor.  When I started reading what an 2 sensor does, it sounded like a lot of what I was suffering from.  I looked up the part, not very expensive, so I thought I would just replace it.  I'll try to get a pic up today. 

[Fairlane514]

If you have a stock carbureted 305 engine, you don't have an O2 sensor. I think its what Irish Alley posted......oil pressure sending unit.....they do look crooked.

O2 sensor is mounted near the exhaust manifold  (usually just below it) and would send information to a computer.