Depress the accelerator too far and the car bogs down. Feels like its starving for fuel. Rpm's simply top out and the car loses power, especially when going uphill. Seems to be a bit better with momentum but if the pedal is depressed. Vrooom but going nowhere slowly back off the accelerator and hit it a few times it will shift up and begin to accelerate as long as I don't give it too much gas.
If I go too far it bogs down again. Through any and all gears. Fuel pressure is 55 psi. Changed the filter twice anyway. First time discovered the one on the car was installed with flow pointing to tank. I figure someone just stuck a screwdriver through it before then. I have replaced the coils did find one out of range and replaced the ignition module. Thing of that is I have four modules now for this car and all four have different readings.
I don't know if one or all is good or not. I also changed the wires and plugs. Did a trans service and fixed the transmission oil cooler fan and exhaust leak in the resonator just under the transmission oil pan that was cooking the transmission. Old transmission oil looked like dark grape juice compared to the koolaid clarity of the Dextron I replaced it with. I also found and repaired a host of broken or cracked vacuum vacuum lines and for the heck of it replaced the timing belt including tensioner and water pump prior to this issue developing.
Do you. Welcome to 2CarPros. You indicated that you replaced the timing belt and several vacuum hoses prior to this happening. Did you recheck your work? Also, have you checked for a plugged catalytic converter? I do need clarification on one thing. Does it seem the transmission is slipping? Thus causing a lean condition. Fuel cut is actually caused by the ECU seeing more air entering the engine than it was originally programmed to use. This likely cooresponds with an injector duty cycle which is unsafe or unattainable.
So basically fuel cut is caused by the MAF seeing too much air. If a fuel pump cannot provide the correct pressure, fuel may have difficulty making it to the engine. A vehicle that hesitates while accelerating or while driving up a hill may have a weak fuel pump.
Dirty fuel injectors may cause the engine to run lean which will in turn, cause hesitation when accelerating. An acceleration problem is usually the result of insufficient fuel, air, or spark during the combustion process. One may also ask, what would cause a car to hesitate on acceleration? Another common cause are dirty fuel injectors. Other problems that cause acceleration stumble include vacuum leaks, low fuel pressure, a weak spark caused by low coil voltage or bad coil s , retarded ignition timing, and contaminated gas.
Bogging down is usually caused by one or more of three things. Running rich, running lean, or a weak spark. The most common cause is a failing automatic choke unit. You can either clean your filter or replace it to fix the problem. A clogged supply lines, a bad fuel pump, a faulty fuel nozzle can also hold your car down. Causes of Engine Hesitation.
Can spark plugs cause bogging? The primary culprits are simple — spark or fuel — usually manifesting in spark plugs, plug wires, the coil s or the fuel-delivery system. When the misfire results from a fuel related issue, this is commonly related to a lean fuel condition lack of sufficient fuel supply to the motor.
What are the symptoms of a bad accelerator pump? Another symptom of a faulty accelerator pump is engine sputtering or stalling. The sputtering is caused by the lack of fuel that is supposed to be provided by the accelerator pump when throttle is rapidly pressed.
What causes poor acceleration? Any suggestions? This sounds like a very tricky problem to diagnose. Did you check the fuel pressure with the fuel pressure regulator disconnected? There could be a problem with the throttle body or the throttle position sensor.
There is also a chance that the ECM has failed causing a flooding issue, or there is a bad ground wire for the ECM or ignition system.
The only way to know for sure would be to use a more advanced scan tool and watch all the live data values while driving the car, to see whats going on with the car. Q: bogs down with heavy acceleration no codes all sensors read normal fuel pressure is ok. My car has miles. My car has an automatic transmission. Toby Schultz Automotive Mechanic. The statements expressed above are only for informational purposes and should be independently verified.
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