Question about 1999 Chevrolet Astro

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1999 chevy astro OBD

New plugs and wires, New distrib., OBD still reads misfire. Plugs in correct order. Where may the problem lie?

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Could be a vacuum leak have you done a compression test if you have low compressin in a cylinder will cause that also if compression is good and no vacuum leaks look at the injectors and injector harness

Posted on Oct 13, 2008

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I have a Chevrolet 1999 Astro van RWD 4.3L , check engine light turn on with blinking at the same time.Code P0302 pop-up, I have given a complete Tune-up,change belt,tensioner and still check light st


DTC P0302: Cylinder 2 misfire detected. Probable cause:
1. Check for latest control unit software update
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system fault. Check ignition module, coil, spark plugs and wires even if these are new replacements
5. Fuel system problem

Nov 23, 2014 | Chevrolet Cars & Trucks

2 Answers

Why the loss of power and po300 code?


HARD TO SAY WITH OUT BEING THERE BUT THIS MIGHT HELP .
Crankshaft sensor Was the trouble with my 99 Chevy truck after replacing many components like coil cap rotor wires and so on .
http://www.obd-codes.com/p0102 Code P0300 Causes and Fixes Code p0300 is a code that is generated when your engine has a misfire that is not related to only one cylinder. Sometimes this code will be set in addition to other codes such as p0301 which means that there is a misfire on cylinder 1 (cylinder 1 is the number one cylinder when looking at the firing order. It is generally the forward most cylinder on the engine.). If these engine codes are present as well the you should diagnose those first as they are probably causing code p0300.
This code will set your check engine light and needs to be fixed as soon as possible. If it is not then you will probably need to replace your catalytic converter as well as the problem that is causing your misfire.
There are many causes for this obd code. Since it is a "random misfire" or "multiple misfire" this means that the misfire is on different cylinders and not just one all the time.
Common Causes
  • Low Fuel Pressure
  • Vacuum Leak
  • EGR system malfunction
  • Internal Engine Problems (such as low compression)
Less Common Causes
  • Faulty Coil
  • Faulty Spark Plugs and/or Wires
  • Camshaft or Crankshaft sensors
  • Ignition module
  • Computer

Jun 12, 2014 | 1998 Chevrolet Tahoe

1 Answer

1992 CHEVY ASTRO VAN KEEPS MISSING HUSBAND CHANGED DISTRUBUTOR , CAP , WIRE, PLUGS, COMPUTER AND STILL MISSING WHAT COULD IT BE


missing is not always the plugs ,HT leads distributor . Most times it is from misfiring injectors and low fuel pressure.

Mar 04, 2014 | 1999 Mercury Villager

1 Answer

New plug misfire in dodge ram 1500 6 cyl van


could be your coil, but can also be internal, have you replaced both the air & fuel filters ? if so, dump some good fuel injector cleaner into tank when half empty , top off with 91-92 octane fuel, see how that works for you, do some highway driving, stop & go traffic creates problems, todays fuel w/ethonal is bad for older cars, be sure to have code cleared from ecm !

Feb 15, 2013 | 1999 Dodge Ram

2 Answers

1994 chevy truck misfire. Changed plugs, wires, distrib cap, rotor, module, and fuel filter.


The easiest way personally to check for a misfire is (with old set of plug wires though) ground a test light. Poke through each plug boot at distributor. If it makes engine miss more not a problem cylinder. When you get to one where there is no change, that is the cylinder that is missing. Not saying that it will cure your problem, but it would rule out the good cylinders that are operating correctly. Make sure you don't touch bare metal because it will shock you. It might not miss either unless under load. Firing order is 18436572 ccw on cap. 1 cylinder drivers side closest to radiator. Drivers side 1357,passenger side 2468. Looking from front of engine to back of engine.

Feb 16, 2011 | 1994 Chevrolet K1500

1 Answer

I have a 1999 Chevy Astro that is giving me a P0300 trouble code. So far I've replaced the plugs, wires, cap, rotor, coil, fuel filter, air filter, and catalytic converter. I'm still having the...


P0300 Diagnostic Code - Random Misfire
Technical description:--
Random/Multiple Cylinder Misfire Detected:---
Exactly what does this code means:--
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
Symptoms:--
the engine may be harder to start.the engine may stumble / stumble, and/or hesitate.
other symptoms may also be present…There may be rough idle, sputters and stallsand jerks.
Causes:--
A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires, Faulty coil (pack), Faulty oxygen sensor(s)
Faulty fuel injector(s),Burned exhaust valve, Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.
Possible solutions for this error problem:--
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the vehicle, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or un-metered air getting past the airflow sensor, or an EGR valve that is stuck open.

Aug 26, 2010 | 1999 Chevrolet Astro

1 Answer

2000 astro with 4.3 new plugs ,wires,cap,rotor,dist. get 2 codes misfire cyl 3 and lean fuel mix bank one


sounds like you may have a stuck closed poppet (fuel injector) inside your plenum. No fuel would cause misfire and a lean conditon. Also a vacuum leak in that cylinder would cause a misfire but yoyr spark plug would be fuel fouled.

Jul 26, 2010 | 2000 Chevrolet Astro

2 Answers

Why is my 1997 expedition showing a misfire on number 2 cylinder OBD code PO302. Also I am getting code readings PO174 andPO171 system to lean on Bank 1and 2


PO302 is being a misfire, could mean the plug is bad or the coil is bad for that cylinder. Which can give you the misfire reading and the system to lean codes. Check the #2 coil for firing.

Jan 28, 2010 | 1997 Ford Expedition

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