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Chevy Astro van 4.3 litre: can't give it more than about half throttle or it bogs down... sometimes. At other times, it will take much more throttle. Any ideas?
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Sometimes a car idles high because the mass airflow sensor doesnt work and then the throttle sensor assumes a default position of wide open. Maf, Map, and tps are connected.
loosen fuel lines at throttle body when turning key to on possion , careful not to spill gas all over engine, do you hear fuel pump running and try to put at least 4-5 gallions of fuel, you could try a (LITTLE ) shot of starting fluid ?good luck hope this helps.
Clean the throttle body with throttle body cleaner and make sure the air filter is not dirty or plugged.Also clean the mas air flow sensor with mass air flow sensor cleaner.Give this a try and let me know if it took care of your problems.Hope this helps.Good luck.
THE FIRING ORDER IS AS FOLLOWS : 1-6-5-4-3-2.
CYLINDER NUMBERS (front-to-rear) :
LEFT (driver side) 1-3-5
RIGHT (passenger side) 2-4-6
To set ignition timing, ensure that engine is at operating temperature, (190 degrees or above), bypass EST (electronic spark timing) by unplugging the single tan wire with a black stripe from the distributor. Ignition timing should be set at 0 degrees or TDC (top dead center). If not, loosen distributor hold down bolt and adjust, then retighten.
most likely a weak fuel pump or a clogged filter. Check fuel pressure with a gauge or as its bogging down spray brake cleaner in the Throttle Body. If this allows it to increase RPM then its the pump or filter.
There was a recall on the throttle body blade on the 4.3 a few years back for the throttle body to stick in the close position. Yours being 9 years old makes me think that there not going to do anything for it but give you the solution to the sticky throttle blade.
The solution was to change the blade. You can try cleaning the throttle body blade by spraying throttle body cleaner in to the barrel of the throttle body. If you look down, you'll see the carbon build up and it may just need and good cleaning.
If that does not work, you can buy a new Throttle body blade which is only held on by two screws on the throttle blade shaft.
Start with cleaning the blade and throttle body with throttle body cleaner. Just follow the instruction and you'll be fine.
Keep me posted and good luck.
underneth the intake manold is were your fuel injector poppet nozzles are, more than likely the fuel line hose that goes thru the back of the intake is split and leaking fuel underneth the intake manifold if you check the fuel pressure you will find that the fuel pressure will drop down to 0 psi as soon as the fuel pump shuts off and it should hold pressure
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