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(I guess the first post didn’t go through)
Hey guys, well I got it fixed: Idle Air Control and Fuel Pump were the culprits. It now runs good.
But, there was, and still is, a strong gas odor inside the cab (I’m supposing it is burned fuel). Someone mentioned Charcoal Canister. Does that sound right? And if so, where would it be located, under the hood, or in the engine compartment (which is located inside the van)?
Well, I tried to tie into the TB with the TBI adapter, but the fittings weren’t the right size. I returned the loaned gauge set to Autozone, and they said that they didn’t know of any different sizes, so I guess I’m now forced to either replace the pump as a test, or send it to another shop. It appears that a new pump is about $50 for this, so that ain’t really a bad price, I don’t think. I just wish I could be sure before tearing into it.
I tried underneath, as well (as I said previously), and it just wouldn’t fit.
Thanks for trying cap.
OK, I’mm a bit confused, but if I use that adapter (if it fits at the TB) I won’t need the tee, right? I will connect the end you marked TB fuel supply port to where I took the fuel line off, and the other end (fuel supply line) will go to the line from the filter.
I got the pressure gauge the other day and am trying to work with it today. No luck so far. Not sure how to connect it. Here’s what I’ve got:
The flex line that you spoke of between the filter and TB is accessed from underneath the van, so I take that apart. I now have two lines (one from the filter, one going to TB).
There is what I believe to be the t-fitting you spoke of:
[URL=http://s249.photobucket.com/user/tacticaltal/media/tfit_zpslhxfvypg.jpg.html][IMG]http://i249.photobucket.com/albums/gg201/tacticaltal/tfit_zpslhxfvypg.jpg[/IMG][/URL]
This screws into the gauge, but how to connect the two ends? I have two rubber hoses, but neither is big enough to fit the metal end going to the TB, and the end going to the filter is a female, and so no hose is going there, so I don’t believe I’m supposed to be using the rubber hoses to connect the two lines. Either that, or the above isn’t the t-fitting you spoke of.
What am I missing?
EDITED TO INCLUDE: The flex line going to the TB has a metal male connector, while the line going to the filter has a female metal connector.
Well, I haven’t had a chance to investigate the fuel pressure yet, but I plan on it the next couple of days. In the meantime…
The truck is running but it is still wanting to die, both at at idle, and when I drive it. I am able to keep it running though. Does this sound like a fuel pump problem? I mean, I would think that if the pump is bad it wouldn’t start back up after all the problems I’ve had.
Obviously the pump is working or I wouldn’t be able to drive it at all.
Another symptom I thought of is when I first brought it back from the shop, it would surge a bit, but that seems to have gone away.
[quote=”cap269″ post=137794]
2.I did a voltage reading on the MAP sensor, and I got 4.8v on both the power and signal side. Since I didn’t have a vacuum pump, I tested this with the vac hose connected/disconnected, with no change in voltage. I also disconnected the vac hose and sucked on it while measuring voltage, and the voltage dropped from 4.8 to to 3.8 or so.
That sounds normal. These MAPs should read 4.8 on the signal at normal pressure (14psi, 1bar, no vacuum). Dropping to 3.8 when vac applied is appropriate behavior, but without a vac pump where you can measure the applied vacuum you can’t be sure the voltage drop is correct for the amount of vac. If the car was running when you did the voltage test with the hose connected and you got no voltage drop, there wasn’t any vac on that hose at idle, which is not correct, and indicates a bad hose, restriction (not likely), or a vacuum leak in the system such that vac was not available. The engine produces the most vacuum at idle and deceleration, so you should be seeing vac on that sensor at idle.[/quote]
Cap, Thanks for the reply.
I think I’m going to change the plugs and wonder if you can help me with that. This engine is a C1500 (1990). Can you recommend the correct plug for this engine? It is a V6. ALSO, Where could I find the correct gap for the plugs; I don’t have a manual.
I’m also suspecting a fuel pump problem, but I’d like to use a gauge to find the pressure but I don’t know where to check from. Do you have any exp. with this engine?
