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Constant surging 1989 chevy cheyenne 5.7 replaced fuel filter checked air intake replaced EMC tune up done. checked hoses for leaks. Still surges and can't get any codes including code 12.

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I suggest putting a pressure gauge on the fuel line bleeder valve and check the pressure coming from the pump. If the pump is getting weak it will cause the truck to surge. Could also be the catalytic converter stopping up as well. I'd check fuel pressure first. Hope this helps you out.

Posted on Apr 09, 2015

Testimonial: "Thank you have checked pressure already . I'll check converter next"

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Idle surges


surging problem could be vacuum leak check all vacuum hoses on intake manifold.hook vacuum gauge to check engine vacuum could have intake manifold leak or could have bad spark plugs and wires.distributor cap and rotor need replacing.ignition timing off.if all is good clean fuel injectors and change fuel filter.if fuel pressure low or pump failing engine will surge real bad.if your air flow sensor bad or egr valve bad the check engine light will turn on.best have vechicle hook to code scanned check emission control system.many things cause engine surge dirty fuel injector faulty fuel pressure regulator have vechicle code scan to save from guessing spending way too much money.

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I have a 05 1500 4,7 and when idle the rmp go up and done a little why is that


various problems but mostly i find idle surging and droping over and ove r is a vaccume leak, or an intake leake somewhere, such as in the air filter housing, air intake tube, or at intake to manifold seal. check vacumm lines, air filter ect. fuel filter replacement wouldnt hurt, is there a check engine lite?

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My 1992 chevy g20 van surges and i'm not sure exactly why. I changed the pcv valve, fuel filter, spark plugs, and air filter. What are some possibilities


My first thought would be a vacuum leak in one of the hoses. Rubber hoses get brittle with age and even a small crack in a hose may cause surging. Happened to me in a Lumina.

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I have a Mazda Tribute '02 and randomly when i drive it it starts jolting like it is struggling to go when i accelerate. Its usually when i go over 60kph but sometimes i can drive it a short distance...


FUEL PUMP GETTING WEAK.CHECK FUEL PRESSURE.AFTER YOU DO AFTER YOU REPLACE FUEL FILTER AND AIR FILTER. THEN CLEAN FUEL INJECTORS BY POURING A CAN OF SEAFOAM TO 3/4 TO FULL TANK OF GAS.CHECK FUEL PRESSURE SHOULD BE 65 PSI. IF FUEL SYSTEM OKAY.YOU HAVE INTAKE LEAK CHECK ALL VACUUM HOSES AND PCV VALVE FOR VACUUM LEAKS,HAVE VECHICLE CODE SCAN VECHICLE LOOK FOR TRANSMISSION FAULT CODE.FAULTY TORQUE CONVERTER CAUSE ENGINE TO SURGE.LOOK FOR TPS FAULT CODE.AND IDLE AIR CONTROL FAULT.THEY BOTH CAN CAUSE SURGE PROBLEMS.

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1 Answer

1988 f-250 w? a 351 windsor is surging...is it the map sensor?


HI. there are several problem areas that will need to be inspected. follow the list below to address this issue further.

CHECK LIST:

1. Fuel Filter. If the filter has not been change recently, this will be the culprit. Clogs in the filter will cause surging. replace if needed

2. Intake Manifold Gasket. Check this gasket for leaks, or worn edges. replace if damage is visible.

3. Fresh Air Intake Hose. This hose may be clogged, or damaged. inspect for these faults. replace if needed.

4. Fuel Pump. A weak, or poorly grounded pump will cause low fuel pressure, in return, causing the surge effect. inspect the fuel pump for these faults. replace if needed.

5. Fuel Injectors. A dirty, or faulty injector will cause the surge as well. inspect the injectors for faults. replace any injector that is faulty.

6. Oxygen sensor(s). A faulty O2 sensor will promote surging as well. This will usually be accompanied by an illuminated check engine light. If this is the case. the O2 sensors should be changed.

7. Carburetor. A Dirty and Improperly Functioning Carburetor will cause the surge effect, also. Check to make sure the carb is functioning correctly(IF EQUIPPED)

8. Map Sensor . A defective manifold absolute pressure sensor may cause a rich or lean air/fuel ratio, excessive fuel consumption, and engine surging. this diagnosis applies to map sensors that produce an analog voltage signal. To check the sensor, back-probe the 5-volt reference wire(with the ignition on), and connect a voltmeter from the reference wire to ground. If the reference wire is not supplying the specified voltage, check the voltage on this wire at the computer. If the voltage is within specifications at the computer, but low at the sensor, repair the reference wire. When this voltage is low at the computer, check the voltage supply wires and ground wires on the computer. If these wires are satisfactory, replace the computer.

With the ignition switch on, connect the voltmeter from the sensor ground wire to the battery ground. If the voltage drop across this circuit exceeds specifications, repair the ground wire from the sensor to the computer.


This concludes the surge inspection chart. you will find the issue in one, or more of the areas stated above.


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'93 Chevy Cheyenne 4 WD uses excessive fuel (4.3 V6)


check for tune up
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distributor cap worn plugs worn

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Engine Surges and Lo trac light comes on then goes


1.Intake air vacuum leak. Check all hoses and bolts for tightness. With the engine running, wiggle all hoses around and listen for a hiss. 2. Change fuel filter, check fuel pressure. 3. Faulty idle control system/sensor.

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1 Answer

Engine pulsates during idle and from second to third gear


Try checking for vaccum leaks, use carb cleaner and spray it around the base of carb, vaccum hoses, edges of intake manifold, take pliers and squeeze the big line to brake power booster & see if it changes, pull the pcv valve out and cover with your finger see if it changes idle.

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1 Answer

Engine surges only after it warms up!


It sounds like an intake manifold vac leak. After the engine warms up use a can of spray carb cleaner at all edges of the intake. Use short bursts of the cleaner and see if the RPM changes. If it does you have a vac leak. That means replacing manifold gaskets.

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