Question about 1989 Ford Bronco

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Engine idles to fast and runs rough

1989 Bronco with 5.0 Engine. Engine idles at appx 1200 RPM. Checked EGR valve, checked OK, removed and sealed int. port. No change in idle.
Remoived idle air bypass valve sealed int. port, no change in idle. Checked idle air bypass valve seat, checked OK. Checked throttle position, checked OK. Checked throttle plates in intake, they are seated. Anyone have any ideas.

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  • Anonymous Mar 28, 2014

    the truck was running but was rough and barly stayed running at low idle. check all the easy then checked the firing order. came to see the running order was not what the spec on that engine should be so we changed them to the specs now the truck wont start just backfires

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You can check timing, or check for vacuum leaks

Posted on Oct 12, 2008

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How do i fix a code 33 insufficient egr flow


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

Dec 08, 2012 | 1989 Ford Bronco

1 Answer

1989 Mercury Sable GS 3.0L runs rough and idles down and stalls


Sounds like you might have a stuck open EGR valve. Is the check engine light on. I would replace the fuel filter if it hasn't been replaced, also check the air filter.

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1996 Honda Accord Rough Idle Even After tune up performed Changed spark plugs, distributor cap and rotor wheel along with all spark plug wires, changed fuel filter, air filter, spent $150 on fuel injector...


Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

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Has low power, surges @ cruizing speed, rough idle (code 32)


You can remove the egr and see if it has been sealing,and if it still moves.

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Have a code p0401 how do u fix it , I know it has something to do with the egr system but I,m not sure where its located on my trooper, engine size is 3.5 v6


I have a 2000 Isuzu Trooper that had a PO401 code that would reset and then 2 miles later the light was on again - I found if you remove the EGR valve and start the engine that the engine should idle rough - If it doesnt and you have vacumn at the intake port spray carb cleaner down the port slowly and see how long it takes for the engine to run rough - Keep spraying till the engine dies and spray some more down the passage and let the engine set for 5 minutes and then restart the engine - it will run rough at first but clear out - you should be able to feel the engine RPM change when you put your finger over the intake vaccumn port for the egr - If not then repeat the cleaning method again - If you do feel the rpm change then put the egr valve back on and clear the code and run your drive cycle to see if it is fixed.

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WHERE IS THE EGR VALVE ON A 1990 OLDSMOBLE CUTLASS SUPREME LOCATED AT


6ff5ad5.jpg About $140.00

The EGR valve is mounted on the intake manifold and has an opening into the exhaust manifold.

The digital EGR valve, used on all 1990 and later EGR-equipped engines (Except the 2.5L and 1994-96 3.8L engine) is designed to control the flow of EGR independent of intake manifold vacuum. The valve controls EGR flow through 3 solenoid-opened orifices, which increase in size, to produce 7 possible combinations. When a solenoid is energized, the armature with attached shaft and swivel pintle, is lifted, opening the orifice.
The digital EGR valve is opened by the ECM, grounding each solenoid circuit individually. The flow of EGR is regulated by the ECM which uses information from the Coolant Temperature Sensor (CTS), Throttle Position Sensor (TPS) and Manifold Absolute Pressure (MAP) sensor to determine the appropriate rate of flow for a particular engine operating condition.

Digital EGR Valve Testing:

This system must be checked using a Tech 1®or equivalent scan tool. Steps 4, 5 and 6 must be done very quickly, as the ECM will adjust the idle air control valve to compensate for idle speed.
  1. Using a Tech 1®or equivalent scan tool, check for any diagnostic trouble codes and solve those problems first. Refer to the Diagnostic Trouble Code (DTC) lists later in this section.
  2. Select "EGR CONTROL'' on the scan tool.
  3. Start and run the engine, until it reaches normal operating temperature, then allow the engine to idle for 2 minutes.
  4. Energize EGR SOL #1; engine rpm should drop slightly.
  5. Energize EGR SOL #2; the engine should have a rough idle.
  6. Energize EGR SOL #3; the engine should idle rough or stall.
  7. If all tests were as specified, the system is functioning properly.
  8. If not, check the EGR valve, pipe, adaptor, gaskets, fittings, and all passages for damage, leakage or plugging. If all is OK, replace the EGR valve assembly.
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1 Answer

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