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2002 Deville. Rear PCV line broke (goes under intake manifold) would this cause vehicle to run rough? Would air injection pump relay going bad cause any rough idleing?

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  • Cars & Trucks Master
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Yes it would..

Posted on Jan 02, 2014


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Posted on Jan 02, 2017

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SOURCE: Service Engine Soon Light and Rough Idle (Below 1200 rpms)

do you get check engine codes?..have you done a leak down test and compression test to determine mechanical engine health?

Posted on Oct 07, 2008

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SOURCE: 1991 Subaru Loyale- oil in air intake

There are only a few things that cause oil in the intake, most common is a plugged PCV (Positive Crankcase ventilation Valve), this causes pressure to build from the combustion process and forces oil into the air cleaner/air intake system, and in some cases out the oil seals, another issue is excessive engine blow-by, this is when the piston rings don't seal anymore and the pressure once again builds and forces oil into the air intake, the last and easiest to fix is an overfilled crankcase. Excessive oil burning of any kind will destroy the catalytic converter in a short period of time. How many many miles on the car, does it have excessive blow-by?

Posted on Nov 14, 2008

  • 18 Answers

SOURCE: where is the PCV valve on a 2002 Chevy Impala?

Tech jk is right

Posted on Jan 13, 2009

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SOURCE: Air sucking noise from below the intake manifold.

Look for a vacuum hose that isn't hooked up

Posted on Feb 13, 2009

  • 118 Answers

SOURCE: 2002 pontiac montana van ''service engine soon'' light

Diagnostic Aids

  • Low system airflow can cause an intermittent complaint. Inspect for the following conditions:
    • Any restriction in the exhaust system that may produce back pressure
    • Pinched, kinked, restricted, or leaking pipes, hoses, or fittings
    • A restricted pump inlet hose, duct, or filter
    • Pinched, kinked, restricted, or leaking vacuum lines
    • Heat damage
  • A short to voltage in the pump relay control circuit can result in the AIR pump running continuously with the ignition OFF by back-feeding to ground. This will eventually result in pump failure.
  • An AIR pump that had become inoperative and had shown indications of having exhaust gases in the outlet port would indicate check valve failure.
  • Notice Do not operate the AIR pump for more than 60 seconds. Continuous operation of the AIR pump in excess of 60 seconds will damage the AIR pump.

    If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records data can be useful in determining when the DTC was last set. Also refer to Intermittent Conditions

Posted on Oct 11, 2009

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2 Answers

2008 trail blazer 4.2 4x4 fan under the hood runs all the time. Why how to fix?

What fan ? Your vehicle doesn't electric cooling fans , has engine cooling fan and clutch driven by the crankshaft via the drive belt. Your probably taking about the
Secondary Air Injection System Description .
The secondary air injection (AIR) system aids in the reduction of hydrocarbon exhaust emissions during a cold start-up. This occurs when the start-up engine coolant temperature (ECT) is between 5-50?°C (41-122?°F), and the intake air temperature (IAT) is between 5-60?°C (41-140?°F). The AIR pump operates 5-60 seconds after start-up.
The engine control module (ECM) activates the AIR system by simultaneously supplying grounds to the AIR pump and the AIR valve relays. This action closes the relays' internal contacts. The AIR pump and the AIR control solenoid valve/pressure sensor assembly are in turn energized, the pump runs and the control/shut-off valve opens.
The AIR pump sends pressurized fresh air into the pipes/hoses through the open control/shut-off valve, and into the exhaust manifold. The extra air accelerates the catalyst operation, helping it to reach operating temperature faster. The AIR pump remains ON for a short period of time after the control/shut-off valve is commanded OFF. When the AIR pump is commanded OFF it will not run or be activated until the next vehicle start. When the AIR system is inactive, the closed AIR control/shut-off valve prevents air/exhaust flow in either direction.
In the under hood fuse box find AIR PUMP fuse # 64 60amp pull the fuse an see if the fan goes off . There are two relays secondary Air injection (AIR ) pump relay . The contacts may be stuck together .
In the under

Oct 05, 2016 | 2008 Chevrolet Trailblazer

1 Answer

I have a 2004 cadidillac deville with code P0410 & P0420

Circuit Description
The secondary air injection (AIR) system reduces exhaust emissions after initial engine starts. This occurs when the engine start-up coolant temperature and the intake air temperature (IAT) are at the parameters indicated in Conditions for Running. The AIR pump will continue to operate until Closed Loop operation is achieved.
The powertrain control module (PCM) activates the AIR system by simultaneously supplying a ground to the AIR pump relay and the AIR solenoid relay. The AIR pump forces pressurized fresh air into the pipes/hoses and past the AIR check valve into the bank 1 exhaust manifold, accelerating the catalyst operation. When the AIR system is inactive, the AIR shut-off valve prevents airflow in either direction.
The PCM can detect an AIR system airflow fault by monitoring the heated oxygen sensor (HO2S) bank 1 sensor 1 during normal Closed Loop engine operation. This is an active test. The active test will pass or fail based on the response from the HO2S 1. The active test consists of three tests run at 3-second intervals. A decreasing HO2S 1 voltage parameter response indicates that the AIR system is functioning properly.
The AIR system consists of the following components:
• The AIR pump
• The AIR pump relay
• The AIR injection electronic shut-off valve
• The AIR injection solenoid relay
• The fuses, and the related wiring
• The pipes/hoses
When the PCM detects an insufficient HO2S 1 response, DTC P0410 sets.

DTC P0420 Catalyst System Low Efficiency
Videos on youtube suggest you watch P0420 P0420 How To Diagnose Bad Catalytic Converter EricTheCarGuy How to test an electric air pump P0410 case study

Sep 04, 2016 | 2004 Cadillac Deville

1 Answer

Locate pcv on 2008 escape 6cylinder

The PCV valve is installed into the rocker cover using a quarter-turn cam-lock design to prevent accidental disconnection. High retention force molded plastic lines are used from the PCV valve to the intake manifold. The diameter of the lines and the intake manifold entry fitting are increased so that inadvertent disconnection of the lines after a vehicle is repaired causes either an immediate engine stall or does not allow the engine to be restarted. In the event that the vehicle does not stall if the line between the intake manifold and PCV valve is inadvertently disconnected, the vehicle has a large vacuum leak that causes the vehicle to run lean at idle.

26231276-qzqzrlw340p4a2upcuf5y40h-5-0.gif Heated PCV Shown; Non-Heated Similar

Jul 04, 2016 | Cars & Trucks

2 Answers

1995 GMC Sierra 350, Truck has been idling rough.Changed spark plugs EGR valve test drove ran little better. Let sit at idle for a few moments, the truck stalled. Now will not start. Any suggestions?

I would think its a fuel problem.
Try changeing the fuel filter and the air filter but just remove that for now .
The filter is in line drivers side under the drivers door area and is not easy to do but not expensive under 10 dollars .
When you get it off and have gas all over you don't smoke .
Take a plastic soda bottle put it over the line comeing from the tank put the key on run not start .This should make the fuel pump pump if an electric pump.The pump is mesaured IN FLOW PRE MIN and its high because it has return line to the tank if its fuel injection.
So if in 10 sec. 4 to 5 ounces out put the pump is vary good .
If not the pump isn't supplying enough fuel to the system
There are other issues like the fuel injection system and the pressure regulator.
I owen a similiar vehicle you just never what will go wromg NEXT .yet my 30 old ford ranger runs like a new vehicle I fix it of course

Apr 03, 2015 | 1995 GMC Sierra

1 Answer


p0412 Secondary air injection switching valve A circuit
Right side of engine compartiment. ( underhood fuse block )
- Air pump fuse 50A- Air control valve relay- ignition1 fuse 10A ( positive for the relay )The secondary air injection pump relay is located near radiator surge tank.Left front of engine compartiment = Secondary air injection pump

Nov 15, 2011 | 2002 Cadillac Deville

2 Answers

Trying to locate fuel pump relay location on the fuse panel under the passenger side dash. I changed the fuel pump and the truck is still running rough. I changed the fuel filter as well. The roughness is...

your problem is not the fuel pump relay, a relay is just a switch it is either on or off so if the pump is working then the relay is working, i can look up the location for you but i need to know the year, make & model. i think your running problem is more likely a bad spark plug or spark plug wire or ignation coil, again if you give me the year , make, model, engine size i can look up some specific test for you car. also check for trouble codes and let me know what they are and i will look them up as well.

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I have a 2004 freestar with the 4.2L engine and last week got the engine light with the p0171 and p0174 trouble codes. The idle was rough and yesterday, it got so bad the engine will not idle at all. Any...

I just had the same thing. Engine light came on. Rough idle. Codes P0171, P0174, P2195, P2197. Within a week the idle got so bad it would die at stop lights. Seemed like a vacuum leak affecting the idle. Found it today. The elbow where the PCV tube enters the vacuum port on the upper intake was degraded, collapsed and had a whole in it. Wondered why it degraded. I disconnected the tube from the PCV valve and found it quite oily. I think the oil sat in the elbow at the intake because it is flat on top of the engine and could pool there, causing the rubber to degrad. Found a preformed piece of coolant hose at O'Reilly that was the right diameter and cut it to length. Put it on, runs like a charm. I ordered a new PCV valve because I think too much oil was coming through it and caused the hose failure._409.jpg_410.jpg

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3 Answers

I am installing a Holley 2818 on my '65 327 and need help with routing the PCV lines. Which line goes to the PCV inlet on the carb? The rear block inlet or the one on the oil filler neck?

On the 2818 holley there is a calibrated elbow on drivers side of carb about centre of the main body.This connects to oil filler stand pipe in front of intake.Fresh air hose goes from air cleaner to back of block where road draft tube used to be before PCV came along.
The calibrated elbow serves as PCV metered orifice.Be sure flame arrester screen is inside of air cleaner on fresh air connection.

George W.

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Isn't it fuel injected? More likely:
Pull plug wires one at a time, the one that has no effect isn't firing. Bad plug or wire.

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I can't locate the starter relay for cadillac deville 2002

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