Question about 1998 Chevrolet Astro

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Code po100 & p0300 come up. then I clean throttle body with cleaner, then the van stops missing & run good & light go's out.

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P0100 is mass airflow circuit, p0300 is multiple cylinder misfire. Faulty maf sensor is most likely the cause of the misfires.

Posted on Mar 11, 2011

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Starts up but runs rough, exhaust smells, and when you give it gas it wants to shut off.


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Jan 24, 2016 | Cars & Trucks

2 Answers

Vehicle dies when coasting after acceleration, or when coming to a stop.


The first thing to try is to get a can of throttle body cleaner from Autozone or Walmart and clean the throttle valve and the idle speed control valve, they get get gummed up and that causes the annoying stall.

May 03, 2017 | 1989 Toyota Corolla

1 Answer

Transit van cutting out


Okay, no codes and cut out and low idle,

I have seen this on many types of cars and trucks, first have the tech clean the throttle body, make sure he uses a good cleaner and tooth brush, open the plate with his fingers and brush carbon build up off throttle body and plate then rinse clean with throttle body cleaner, next check and clean mass air flow sensor ,

What happens is the throttle plate when closed allows a small amount of air to pass, after time carbon build up closes the gap little more causing lower idle at stops or when gas pedal released in turn causes engine stall at times, the mass air flow sensor also can cause a problem when diodes that read air flow get dirty and allows air to enter without computer knowing and causes lean condition,

Aug 12, 2012 | Cars & Trucks

1 Answer

1993 mercury villager check engine on with code 32 and 34. repair manual says the code 32 doesn't bring the check engine light on but the 34 does. code 34 says problem with the egr valve solenoid or...


After awhile these idle screws don't have a lot of effect, the throttle body & injectors are also probably dirty. The 1.5 turns out from a soft seat is a starting point. Go another 1 to 1.5 turns out to find the sweet spot. Pour a can of Seafoam in with about 1/2 tank of gasoline. That will help clean the injectors & combustion chambers. Clean the throttle body with throttle body cleaner, make sure there is no carbon around the edges of the butterfly and where it seats.
The knocking on starts is most likely from worn bearings. It will knock until oil pressure builds up & is circulating through the journals. I hope this helps.

Sep 24, 2011 | 1993 Mercury Villager

1 Answer

2000 honda odyssey throttle sticks shut when you first touch the gas pedal ( this means everytime my wife takes off from a dead stop she looks like she is drag racing the guy beside her). I first thought...


See if there are any "pending trouble codes" in the car's computer. Major auto parts stores will read your codes out for free. This may be a transmission clutch problem and not a throttle problem at all.

Feb 23, 2011 | Honda Odyssey Cars & Trucks

1 Answer

Very bad engine miss,looking for sparkplug location


Need to take off the plastic on the top of the engine (the plastic box) and the air cleaner hose that goes over to the throttle body. There you will see 6 coil packs. Remove one at a time (2 bolts each), under the coil pack are the spark plugs. I recommend using AC Delco 41-103's for the plugs, will idle better with these. When pushing the coils back on, make sure you hear or feel a little click, too many people install these back on incorrectly, which causes more misfires. If the misfire isn't corrected with the new plugs, check the coils. I also recommend cleaning your throttle body while you're at it, make sure to disconnect the battery while doing this. After it's clean, drive around for 5 miles or so to reset the computer.

If it has a very bad misfire, your check engine light should be on and OR blinking. If it's blinking, don't drive it. You'll probably pull a code of p0300, p0301 & so on which will tell you which cyclinder to focus in on.

Jan 03, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

Dear Sir, I have a 1997 Jeep Cherokee Sport, 6 cylinder 4.0 liter. I recently tried cleaning my throttle body with carb cleaner while the vehicle was running. After spraying a half can of cleaner in the...


do a compression check on the engine, and replace the bad sensor, i take the throttle body off to clean it and some sensors are touchy about cleaner, i fear maybe something got on the egr valve pintle

May 26, 2010 | 1997 Jeep Cherokee

1 Answer

1993 Villager: My van has poor take off power .and it misses on t...


clean the MAF sensor resister wires with carb cleaner carefully. The Maf is in the air intake tube between air filter housing and throttle body.

May 16, 2010 | 1993 Mercury Villager

1 Answer

2000 chevrolet z71 5.3 litre. when i start the truck it idles a little high about 1400 rpm and it stays there for a second then idles to about 500 rpm and it starts to shake perhaps the motor missing but...


Try cleaning the throttle body plates with throttle body cleaner.Also check for vacuum leaks around the intake gaskets.You can also check for codes.Sometimes you can have codes and not get a check engine light.Hope this helps.Good luck.

Feb 24, 2010 | 2000 Chevrolet Silverado

1 Answer

When i press accelerator engine is cutting ....


The van may just need a good tune up.

  • Replace the fuel filter
  • Replace the air filter
  • Replace the PVC valve
  • Replace Engine oil and filter
  • Replace the Spark plugs
  • Clean out the Throttle body with throttle body cleaner
  • Clean out the MAF sensor
This should help you get your van running 100% soon. If your on a tight budget, start with Cleaning the throttle body with spraying throttle body cleaner into the throttle body and cleaning up the MAF sensor with MAF sensor cleaner, just follow the instruction on the can. Then replace the PVC valve and add fuel injector cleaner in to the gas tank. This should help your engine running better and then you can do the rest of the work to complete the tune up. Good luck and keep me posted. If you go to Auto Zone, you can get all the things you need and they can scan your van for any DTC codes that may also indicate what issues your engine has.

Oct 22, 2009 | 1994 Pontiac Trans Sport

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