Question about 1997 Chevrolet Astro

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I replaced the check valve on the air conditioning and one of the small hoses came undone. I cannot find where it plugs back in

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Sounds to me that you have a small vacum line disconected,look at where all the rest of them go and look for a open small hole and I would think that is the spot to plug it back in.Should you still not know the try going to a auto parts store for a Heater - A/C vacum line routing diagram.

Posted on Aug 05, 2010


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97 Grand am v6 up & down idle. Driving =steady acceleration. I've changed, O2 sensor, throttle positioning sensor. Scan is still saying Random misfires? Get warm won't start.

P0300 Random misfire - lean condition , vacuum leak , low fuel pressure , fuel filter plugged partially , mass air flow sensor .
If the misfire is random, check for the following conditions:
System Grounds: Ensure all connections are clean and properly tightened.

MAF: A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition.

Air Induction System: Air leaks into the induction system which bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or faulty crankcase ventilation valve, or for vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.

Fuel Pressure: Perform a fuel system pressure test. A faulty fuel pump, plugged filter, or faulty fuel system pressure regulator will contribute to a lean condition.

Injector(s): Perform injector coil/balance test to locate faulty injector(s) contributing to a lean or flooding condition. In addition to the above test, check the condition of the injector O rings.

EGR: Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Oct 21, 2015 | Cars & Trucks

1 Answer

I have a 1996 GMC C1500 Suburban. Service engine light is on. Free diagnostic at Advance Auto Parts says "bank 1 too rich". Replaced mass airflow sensor, idle air control valve, all 4 O2 sensors,...

A vacuum hose cut will cause a lot of symptoms, A code indicating a rich conditions indicates a lack of air, or too much fuel. A dirty air filter or a leaking injector will cause this. A faulty O2 sensor will also cause this condition.

Apr 03, 2013 | Cars & Trucks

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Hi i hava two code im ford focus 2007 p0491 and p0410 no can fix what doin


P0491 is a Secondary Air System fault Bank 1.

Bank 1 refers to the passenger side off the engine. The combination valve for secondary air injection did not preform as it should & set a fault. The valve is located under the plastic engine cover at the rear of the right cylinder head.

There is a plastic tube from the air pump to the valve that breaks, the valve sometimes fails, there is a vacuum hose that opens the valve that also sometimes fails & rarely the Air Injection Vacuum Control Solenoid Valve fails. The plastic tube unpluged/cracked or failed valve are the 2 most common failures.

If it's a vac leak it's in the small hose from the solenoid valve to the combination valve. The super charger may affect the vacuum, but I would expect to see more codes if it was really messing with things. The air injection system only runs for about 1.5 minutes on cold starts. If the plastic tube is broken you will hear what sound like a small exhaust leak.


What does that mean?

The P0410 code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.

About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.

Possibly symptoms include:

* MIL illumination obviously
* Hesitation on acceleration
* Noise from a bad/stuck AIR pump


A code P0410 may mean that one or more of the following has happened:

* Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
* Blown AIR pump fuse due to freezing up

Possible Solutions

Note: There is a technical service bulletin (TSB) regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose.

Additionally, if you simply replace the AIR pump the problem may return again (and again). If you replace the pump, also clean out the hoses and replace the one-way check valve. In a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.

Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!

* Replace the AIR pump AND one-way check valve
* Test and clean the AIR pump AND test and replace the one-way air check valve
* Replace the AIR pump inlet hose
* Replace the AIR pump fuse (found under the hood)

The above are the interpretation of the codes.

Let me know if you need further assistance.


Sep 15, 2011 | Ford Focus Cars & Trucks

1 Answer

There is oil all over the carb and is puddled where the air filter goes, why

There is a "blow-by" hose coming from the valve cover that plugs into the side of your air filter. If you get blow-by (compression leaking from the combustion chamber--top of the pistons--past the rings and into the crank case) then this hose is where that pressure goes. As the engine ages, this blow-by can get pretty significant, and the volume of air can carry oil from the crankcase up that hose and deposit it above the carburetor. My mustang of a similar year had a small check-valve right where this hose plugs into the valve covers. Sometimes replacing this is a good first step... of course you can try cleaning it, but they are cheap. After that, you may need a ring-job done to the engine to tighten it up. Good luck!

Aug 15, 2011 | 1985 Ford Ranger

2 Answers

Engine keeps raving on idle

You have two big things to do : - Check and fix the fuel line. The fuel filter, gas pump, hoses, fuel linkages should in good conditions. If your jetting is in problem, your primary jet should be has check and fix first.
- Ignition. The coil, spark plug and the cables. The coil should in good condition to produce good ignition. Ensure the cables are not have the leaks. The spark plug also must clean all times. If you have dirty spark plug, you may have rich AFR ( air fuel ratio) or you have the on oil seals ( piston or valves).
So just go through check your engine to seek where the root cause is.

Dec 24, 2010 | 1992 Honda Prelude

3 Answers

1999 cadillac deville runs hot what are my options

The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
Also note that the cooling fans don't come on until the temp hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

Apr 11, 2010 | 1999 Cadillac DeVille

3 Answers

Oil in my air filter case

I take it your engine has a lot of miles on it. Yes changing the PCV valve just might stop it If your old one is faulty excessive pressure may be building inside the crankcase. It should be in the valve cover. Also sometimes the rubber gromet that it is inserted in become very brittle with age so you may have to replace it also.

Feb 10, 2010 | 1989 Jeep Cherokee

2 Answers

Changed plugs,plugwires,discap,rotorbutton. and engine still does not run smooth/please help,,

is your check engine light ON? Has your timing belt been changed? have your intake cleaned, including the IAC valve. Inspect your intake hose for crackes and leaks(this is very typical. If your intake hose is cracked or leaking, this will cause hesitation and rough idling/running. post comments or questions...hopefully this helps

Aug 16, 2009 | 1993 Lexus Es 300

3 Answers

Where is the pcv valve located on a 2003 ford ranger

  • The PCV valve can be located in several places. The most common location is in a rubber grommet in the valve cover. It can be installed in the middle of the hose connections, as well as installed directly in the intake manifold.
  • Once the PCV valve is located, make sure all the PCV system hoses are properly connected and that they have no breaks or cracks.
  • Remove the air cleaner and inspect the air and crankcase filters. Crankcase blowby can clog these with oil. Clean or replace such filters.
  • Oil in the air cleaner assembly indicates that the PCV valve or hoses are plugged.
  • Make sure you check these and replace the valve and clean the hoses and air cleaner assembly.
  • When the PCV valve and hose are in satisfactory condition and there is oil in the air cleaner assembly, perform a cylinder compression test to check for worn cylinders and piston rings.
  • Feb 27, 2009 | 2003 Ford Ranger Regular Cab

    1 Answer

    Will not start

    Check if fuel or spark problem,..all engines need both to run...use starting fluid in air intake ,..if it runs very shortly-fuel pmp?,,ck for spark at spark plug,work your way back..also ck timing belt-intact? Kev-MN

    Nov 30, 2008 | 2000 Ford Ranger SuperCab

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