Question about 1989 Ford Bronco

1 Answer

How do i fix a code 33 insufficient egr flow - 1989 Ford Bronco

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    Uploaded 5 video answers.

  • Expert
  • 141 Answers

First thing you should do is determine if the valve has vacuum to it start the engine unplug the vacuum line located on top of the valve place your fingertip on the end of the hose and raise the engine rpm slowly go to around 3000 rpm you should have a steady 3 to 5 inches of vacuum if not goose the throttle a few times to see if you get a signal for second or too during the throttle snap if you do or have the steady signal then the next step (with the engine running) is to place a small hose onto the vacuum port of the egr valve if you do not have a vacuum pump you can **** on the hose to simulate the vacuum signal and open the valve manually the engine should stall or or cutout and run rough until you release the suction on the hose if it does not change the idle at this point the valve will need to be removed and the egr passages will have to be cleaned with the engine off once again apply vacuum to the valve you shoul be able to hear the valve open or feel a slight pop when you release the vacuum if you cannot the valve is bad if you did not receive the vacuum signal at the beginning of the follow the vacuum line from the egr valve to its source (not sure witch style of egr system you have there is several ford used from 85 to 95 and you could have any one of them just depends) so lets just start with this for now FYI...all these test need to be be done with an engine a full operating temperature

Posted on Dec 09, 2012


6 Suggested Answers

  • 2 Answers

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

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.
the service is completely free 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.

Posted on Jan 02, 2017

  • 14 Answers

SOURCE: egr valve insufficient flow detected

You probably pulled a code p0401, insufficient egr flow. Your DPFE sensor is more than likely at fault. There has been a lot of trouble with these sensors. Then reset CEL or disconnect battery for 5 minutes.

Posted on Aug 17, 2008

  • 331 Answers

SOURCE: I'm getting an engine check light, the OBD-II is P0401.

I would check the front o2 sensors because usually the EGR flow is detected by:

The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.

Posted on Oct 13, 2008

  • 334 Answers

SOURCE: trouble code P0401

It sounds like the iat sensor "intake air temperature" sensor. When its cold it enriches the mixture.
God Bless Greg

Posted on Dec 05, 2008

  • 5568 Answers

SOURCE: Ford F250 EGR problem

The EGR valve (Exhaust Gas Recirculator) provides a path from ******** to nose of your engine, returning some of the exhaust fumes to the intake to supposedly improve tailpipe emissions.
Uh huh, I agree. Seems like a stupid idea and each car I have cheated (that couldn't tell I was cheating) has gained a little on gas mileage but never as much as 10%.
Your Ford apparently has a sensor to rat you out if you cheat it so the quantity of fumes isn't satisfying that sensor.
This could mean that the EGR is clogged (it's a small hole passing dirty exhaust fumes), failed, or the vacuum line that controls it is cracked or otherwise broken.  

Posted on Dec 09, 2008

  • 4669 Answers

SOURCE: exhaust recircuulation flow insufficient detected-p0401.

Can you give me a code number. Also the egr ports plug in the elbow the valve is bolted to. Remove the elbow and clean the ports.

Posted on Mar 15, 2009

Add Your Answer

Uploading: 0%


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



Related Questions:

2 Answers

I need to know what the problem the p0401 what is the problem 1999 grand Victoria Ford 4.9

wow I wish ford could make a egr system that wouldn't fail as I've seen this one go a lot lately ! anyways the code is for insufficient flow in the egr system , this is a means to recirculate some of your exhaust back into your intake , as a means to reburn some of your excess fuel (emissions) , anyways it consists of a means to meter some of the exhaust , and control it (off/on) also to measure the amount that goes in , its part of the closed loop of the fuel inlet system , the fault code is specifically saying flow sensor cant detect any flow in the pipe , there can be a few causes for this including a bad flow sensor , all are from my opinion a poorly designed system (it doesn't self clean it's self ) as almost a guaranty every 60k miles your gonna have some problem with it

Feb 03, 2016 | Ford Cars & Trucks

1 Answer

Egr flow insufficient

Depends on the year,make,model and engine size to determine the reason for the insufficient EGR flow which sets a p0401 engine code. If it is a Ford vehicle the most common failure is a bad DPFE sensor. If it is a GM vehicle with an electronic EGR valve, the valve is usually bad. Most imports use a EGR temp sensor which ends up being a bad sensor or vacuum line to the valve. Send me more info and I will be glad to help you fix the problem.

Feb 25, 2015 | Cars & Trucks

1 Answer


On your EGR tube you have two hoses coming off of it. If you put them on in reverse you will get a code of insufficient flow. I put headers on and replaced EGR tube and valve and the flow sensor and that's the code that I received switched the hoses and solved the code

Feb 26, 2013 | 2000 Ford Expedition

2 Answers

I have a code P0401. What is this and how can I fix it?

P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

Mar 20, 2011 | 1998 Ford Taurus

1 Answer

Engine code p0401 in 2004 ford explorer 4.0 motor insuficient gas flow detected

p0401 is egr flow insufficiant. check or remove and clean egr and port. and also check the vacuum lines to egr. Insufficient EGR flow frequently is caused by clogged EGR passageways.

Aug 19, 2010 | 2004 Ford Explorer

2 Answers

I have a OBD II Trouble Code PO401

EGR Flow Insufficient Detected

May 15, 2010 | 1999 Chevrolet Lumina

3 Answers

HELP!!! My CE light keeps coming on, and when I hook up the code reader it keeps giving me a code 33 EGR valve code. The truck is a 5 speed without an egr valve. I cleared the codes many times and it just...

Fault code 33 means that the exhaust gas that flows into the upper intake when the EGR (Exhaust Gas Recirculation Valve) valve is opened is insufficient, or was not sensed during active test by system computer, the 1st thing to do is pull a vacuum on the EGR valve the engine should stall or nearly die, it will shake like crazy if EGR flow is ok, if this doesn't occur and the EGR valve was seen to pull open u will need to remove the EGR valve from the upper intake manifold and clean/clear the EGR exhaust gas passage in that manifold, they get full of carbon and sludge and then restrict the gas flow from the EGR and throw the fault code 33, most times a piece of stiff steel wire and carb cleaner with compressed air will do it, in the worst cases I have had to have the upper intake boiled out by a machine shop.

Apr 23, 2010 | Ford Ranger Cars & Trucks

1 Answer

OBD code P04001 Insufficient flow, I changed the

did you clean the EGR passages? take the valve back off. one hole will have exhaust, the other should have strong vacuum.ususally the passage gets plugged with carbon, from the valve to where it goes into the intake manifold. you may take a wire and carb cleaner to clean the passage.

Oct 20, 2009 | 1997 Chevrolet Lumina

1 Answer

Egr valve insufficient flow detected

You probably pulled a code p0401, insufficient egr flow. Your DPFE sensor is more than likely at fault. There has been a lot of trouble with these sensors. Then reset CEL or disconnect battery for 5 minutes.

Aug 12, 2008 | 2000 Ford Taurus

Not finding what you are looking for?
Cars & Trucks Logo

116 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

76848 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers


Level 3 Expert

5546 Answers

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

Answer questions

Manuals & User Guides