I have a 2005 VW jetta GLI 1.8t; every once in awhile at random times acceleration cuts out(lose acceleration and nothing happens when I pump the accelerator) then it kicks back in again on its own. a couple of times the engine died. now it only seems to happen randomly when I am under a quarter tank. I had the fuel pump replaced and it still happens. do you have an idea of what is happening? I have taken it to the dealer several times and they couldnt fix it. Ive taken it to a vw specialist and he was stumped. can you help?
Country: United StatesMake: VolkswagenModel: jetta GLI 1.8tYear: 2005Engine: 4cyl
replaced fuel pump, taken to dealer several times with no progress, taken to vw specialist who didnt have an answer either.
Hello,Thank You for choosing Just Answer for your query. Yes, I can help you.Based on your description, these symptoms could be consistent with a failed fuel pump relay or Main Power Supply Relay. The fuel pump relay not only powers the fuel pump, but supplies power to the Injectors and engine control module via a separate terminal. This is by far the most common reason for a no start or stall or stumble condition without storing any Diagnostic Trouble Codes (DTCs). The fuel pump relay is in position #4 on the central electric relay panel. If you remove the kick panel above the driver’s feet, it is in the relay panel with the many red wires attached to studs from the bottom, labeled 30, 15, X, etc.. The fuel pump relay should be the 4th relay from the left, immediately above the wires. I have repaired many VWs and Audis with this condition by replacing this relay and/or the Main power supply relay.The Main Power supply relay for the computer and fuel system is located in the engine compartment relay panel in the engine compartment.I suggest you replace both of these relays first as they are the most likely cause. If the condition persists the electrical portion of the ignition switch is likely failed/failing and I recommend to try that next.I hope I have answered your questions and addressed your concerns. Should require any further assistance on the matter, please do not hesitate to ask. I want you to be 100% satisfied with my answer.Positive feedback, referrals and bonuses are always appreciated! If you decide to accept this answer, please click the ACCEPT button by THIS answer.Thank You!Jake “The VW Doctor”Jake41090.0634145833
Over 30 years experience with VW, Audi, BMW. Factory trained, former Shop Foreman, Service Manager
thank you very much for responding with a detailed answer. this seems to be a much cheaper resolution than having to take it in for a diagnostic and told to replace the pump. all of which would cost me about $1,000. unfortunately my situation is random and there is no way for me to check to see if it worked until something goes wrong again. if that is the case, what is the electrical answer for the ignition switch? why would it be the ignition switch?