Question about 1991 Pontiac Grand Prix

1 Answer

Failed e-check. High NO. Think it is the EGR valve. Where is that part? Is it easily changed without pulling or rotating the engine?

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 23 Answers

The egr valve is mounted to the throttle body, but it's often the egr solenoid. pick up a haynes or chiltons manual and diag it.

Posted on Oct 04, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Code#P0404


Could be, but the problem is probably with the connector or wiring back to the BCM.

Jun 04, 2017 | 1998 Chevrolet Blazer

1 Answer

2001 Volkswagen Beetle Failed Emissions


Dear Sir:

EGR Ehaust Gas Recirculation system.the basic component is vacuum-operated control valve that recirculates the exhaut gases through the engine the engine intake manifld and cylinders where they recombine with the incoming air/fuel mixture.The check need special equipment, to some workshop.
sincerely. God bless you.

ernesto cuadra
managua, nicaragua. c.a

see the diagram for details.
3_29_2012_8_23_30_pm.jpg

Mar 29, 2012 | 2001 Volkswagen Beetle

1 Answer

P1401 AND P1311 CODE ON FORD EXPEDITION 2002


P1401 DPFE (Differential Pressure Feedback EGR) circuit high input: This code is in reference to the actual EGR valve monitoring sensor(DPFE). The actual circuit is damaged, thus, producing false negatives.The silicone rubber vacuum lines going to the sensor could also be faulty, as well. I would suggest to inspect the vacuum hoses that run to and from the DPFE sensor. If the hoses are in good shape; Replace the sensor, itself.

You could also check the EGR valve for faults, as well. If you have access to a hand vacuum pump, you can check the EGR passage quite easily with this device. Once you have gathered your pump; Disconnect and plug the vacuum line going to the EGR valve. Connect the vacuum pump to the EGR valve. Start the car and let it idle. Now, apply a simulated vacuum effect with the hand pump to the EGR valve. Your engine should stumble or stall if the passage is open. If it doesn't, the passage is clogged or the diaphragm in the EGR valve is bad. If the passage is open, it's most likely the DPFE sensor.


P1311
Ionization Misfire Detection Module Communication Fault: This code is not a normal ford code. With that said; I would advise to inspect all wiring that is running to the coils on this engine. This code will usually point to a failed coil or coil wire connection. i would also have each coil on this engine tested for their operational value. Check the entire engine harness for pinching or any damage that my be present.

Nov 30, 2010 | 2002 Ford Expedition

2 Answers

Hello 1991 cadillac deville failed for high hc ppm emissions. 973 out of a 220 needed to pass. Egr valve code present. Has original catalitic and oxy sensor too. Runs great when cold but as it heats up...


Your fuel pressure regulator may have failed. See pic below. Find it on top of the engine bolted to the fuel rail. With the engine idling, briefly pull the vacuum hose off the regulator. If gas comes out of the regulator vacuum port, replace the regulator.


download (1)-jnh1p0frnkt3q2fbcpfimq4v-1-0.jpg

0900c1528025ed97-jnh1p0frnkt3q2fbcpfimq4v-1-2.gif

Aug 11, 2017 | Cadillac DeVille Cars & Trucks

1 Answer

Failed emissions....high nox


Sticking egr will raise everything except nox. Bad o2 bad cat hard to give an accurate diagnosis with out checking it

Oct 12, 2009 | 1994 Lexus LS 400

1 Answer

85 volvo dl fuel evaporative control functional (failed) @ smog check


replace the pvc valve and have the egr valve replace.make sure the vacuum hoses connect to egr valve and pvc replace.change air filter.all those things will cause high emission if not working properly.cause you to fail smog test.

May 31, 2009 | 1985 Volvo DL

1 Answer

Failed state inspection


there is an EGR valve, its located on the intake manifold, it could be vacuum controlled, it should be closed at idle and open only when driving. do you have a check engine light on?

Apr 07, 2009 | 1995 Jeep Grand Cherokee

1 Answer

1995 Toyota Camry - Code 71 - failed emissions tests


replace the EGR switching valve and have the machanic clear the engine check light. I think it should help



Mar 25, 2009 | 1995 Toyota Camry

1 Answer

1995 mercury villager check engine code p1200 injector open


P0400 = EGR Flow
P0325 = knock sensor (Do not ever change a knock sensor, they don't affect anything and cost $600 to replace for absolutely no gain)
P1200 = I can't find this one. I think it's injector flow
report back on what you find.
Egr flow may be plugged egr passages or a bad solenoid.
--------------
1996 PCED OBDII-Villager SECTION 1B: Description and Operation
Exhaust Gas Recirculation System
Exhaust Gas Recirculation (EGR) System Operation The exhaust gas recirculation (EGR) system (Figure 1 below) recirculates a portion of the exhaust gases into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. The amount of exhaust gas recirculated varies according to operating conditions and will be cut completely under:
  • Engine starting condition
  • Low engine coolant temperature condition
  • Excessively high engine coolant temperature condition
  • Engine idling condition
  • High engine speed condition
  • Mass air flow sensor failure
The exhaust gas recirculation (EGR) system on the Villager uses the exhaust gas recirculation/evaporative emission (EGR/EVAP) control solenoid valve to provide vacuum to both the EGR valve and the EVAP canister when commanded by the PCM. If the exhaust backpressure is sufficient to close the EGR backpressure transducer valve, vacuum is sent to the EGR valve and allows EGR gas to flow into the intake manifold. If the exhaust backpressure is not sufficient, the EGR backpressure transducer will remain open and allow vacuum from the EGR/EVAP control solenoid to vent to the atmosphere.
The EGR system monitor, for OBD II regulations, uses an EGR temperature sensor to monitor the EGR system. The EGR temperature sensor is a thermister located in the EGR passageway. When hot exhaust gas is recirculated into the engine, the temperature at the EGR passageway increases. This increase is sensed by the EGR temperature sensor and a signal is sent to the PCM to indicate EGR flow. If the EGR temperature sensor does not detect EGR flow when commanded by the PCM after two consecutive drive cycles, the malfunction indicator lamp (MIL) will be illuminated and a diagnostic trouble code (DTC) will be stored. The MIL will be turned off after three consecutive drive cycles are completed with no malfunctions detected. The DTC will remain stored in the PCM memory until 80 drive cycles have been completed without the same malfunction detected in the system.
Figure 1: Exhaust Gas Recirculation (EGR) System Diagram Item Number Description 1 — EGR/EVAP Control Solenoid 2 — Air Cleaner Housing 3 — Throttle Valve 4 — EGR Temperature Sensor 5 — EGR Valve 6 — EGR Backpressure Transducer 7 — EVAP Canister
Exhaust Gas Recirculation (EGR) Backpressure Transducer Valve The exhaust gas recirculation (EGR) backpressure transducer valve is used to control EGR. The EGR valve is operated by ported vacuum, but the ported vacuum will normally be vented off at the EGR backpressure transducer valve. As rpm increases, exhaust pressure increases and pushes on the diaphragm in the EGR backpressure transducer valve and closes the vacuum vent.
Figure 2: EGR Backpressure Transducer Value
Item Number Description 1 — Throttle Valve 2 — Vacuum Port 3 9D475 EGR Valve 4 9F452 EGR Backpressure Transducer Valve 5 — EVAP Canister 6 — EGR/EVAP Control Solenoid 7 — Vent
EGR/EVAP Control Solenoid The exhaust gas recirculation/evaporative emission (EGR/EVAP) control solenoid (Figure 3) is controlled by the powertrain control module (PCM). The EGR/EVAP control solenoid controls vacuum to both the exhaust gas recirculation (EGR) valve and to the evaporative (EVAP) emission canister. When the EGR/EVAP control solenoid is off (12 V signal from the PCM) vacuum is supplied to both the EGR valve and to the EVAP canister. When the EGR/EVAP control solenoid is on (ground supplied by PCM) vacuum is vented to the atmosphere keeping the EGR valve closed and no vacuum to the EVAP canister. The PCM will command the EGR/EVAP control solenoid on at:
  • Engine starting condition
  • Low engine coolant temperature condition
  • Excessively high engine coolant temperature condition
  • Engine idling condition
  • High engine speed condition
  • Mass air flow sensor failure
Figure 3: Exhaust Gas Recirculation/Evaporative Emission (EGR/EVAP) Control Solenoid
Exhaust Gas Recirculation (EGR) Temperature Sensor
The exhaust gas recirculation (EGR) temperature sensor (Figure 4) is a thermister type sensor that monitors the temperature of the exhaust in the EGR passageway. As the EGR flow increases, the temperature increases. This process creates a change in the resistance of the sensor, which decreases as the temperature increases. The signal is sent to the powertrain control module (PCM) to indicate that the EGR system is working properly. If the EGR temperature sensor does not change resistance as the PCM expects on two consecutive drives, the malfunction indicator lamp (MIL) will be illuminated and a diagnostic trouble code (DTC) will be stored.
Figure 4: EGR Temperature Sensor Exhaust Gas Recirculation (EGR) Valve
The exhaust gas recirculation (EGR) valve (Figure 5) recirculates portions of the exhaust gas back into the intake manifold to reduce the amount of the NOx released during combustion and to reduce combustion temperature. The amount of exhaust gases that are released into the engine is proportional to the load on the engine.
Figure 5: EGR Valve

Mar 20, 2009 | 1995 Mercury Villager

Not finding what you are looking for?
1991 Pontiac Grand Prix Logo

Related Topics:

166 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

76630 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8499 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...