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Hi guys,
1990 Astro Van running bad; hesitating, losing power when accelerating, and stalling out. It just started this within the past few months.
Assuming this is either a fuel or electrical problem, and in order to avoid part jumping, how can I determine which it is? If it’s electrical, I’m thinking Plugs, Distributor, etc. If fuel, then either the pump (in-tank), filter, etc. What would I be missing? Could also be a vac leak, but from where? I haven’t located any unhooked hoses.
What’s Been Done:
1. A mechanic has replaced (he said) the throttle body, assuming a crack within. There was a good amount of vacuum heard before this, indicating a leak. His repair has allowed only that the truck can remain in a started state to get me home, but the hesitance is still there, and I know at any moment I will find myself embarrassingly stalled in the middle of an intersection.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.
I’m sure I left out a lot of pertinent info, please just let me know what you need to know, and I will supply what I can.
BTW: can we upload pics here?
Thanks, and apologies for the long post.
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Replies
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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.
(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)?
Glad to read you’re making progress. You may be correct about the fuel smell possibly being caused by a canister problem. But I was thinking you might also want to check the connections near where you were checking, or attempting to check fuel pressure. If something is loose there causing a small fuel leak it could also cause that issue.
Keep us posted.
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