I have a 97 olds 2.4 twin cam engine, if the vacuum line is off of the fuel pressure regulator, will it cause it not to start?
no what jimmy? It WILL cause it to not start, the fuel pressure regulator will not function, it won't know what signal to send and there will be no fuel pressure
To check fuel pressure Disconnect the negative battery cable and loosen the gas cap to let pressure drain from the system. Attach a dual-tube pressure gauge to the test port and drain any fuel into an approved container. For 2.4 litre engine models, loosen the gas cap and allow any pressure to escape. Detach the electrical connection from the fuel pump. Start the engine and let it run until it stalls. Turn the ignition off and disconnect the negative battery cable. Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic. Twist off the fuel pressure test port cap and attach a pressure gauge to the fuel pressure valve if one is not already connected. Reconnect the negative battery cable and turn the key to the first position. Do not start the engine. Check the gauge. It needs to register approximately 41 psi. Pressure that's too high indicates a malfunctioning pressure regulator. Low pressure indicates a clogged fuel filter or a broken fuel pump that needs to be replaced. Cut the engine, relieve system pressure again and remove the negative battery cable. Disconnect the fuel lines and disengage the filter fitting. Remove the fuel filter from its holding bracket. Examine the filter for clogs and replace it if necessary. If there are no clogs, the fuel delivery problem is probably caused by a breakdown in the fuel pump itself.
its pre set varied by vacume, try it one time, pull the vac. hose ,it will still run, no electrical involved, right?
The car was running fine the night before. I went inside came back out the next morning and it started and ran rough and then immediately died. I took the plugs out, check compression on all cylinders it is is at 180 across the board. I also performed a spark test, and I am getting spark to all cylinders. I then noticed that the hard plastic vacuum line that comes from the vacuum canister in leads to the throttle body block was off. It appears that the fuel pressure regulator receives its vacuum from the same block.
Electrical? ..... I don't know yet, I plan on checking the TPS today to see if it is responsible for delivering too much fuel????????
No, that won't cause it to not start, but it depends on how long you want it to run. You are then saying you are getting to much fuel? Could be a fuel regulator, if it does run, go to the exhaust pipe and put your hand over the pipe and smell your hand, that will tell you if your getting to much fuel and not to mention to much fuel in these engines is like when your carb used get flooded just different. Let me check for you on some specs and check on the 2.4 twin as I haven't messed with one in awhile.
and I guess I could have read more than your header, sorry, 1997 Oldsmobile Achieva 4 Dr SL Sedan
Well, being a GM guy, I'll be dipped in Sh@t, and this doesn't answer your question, yet, but I'm working on it and discovered something I sure didn't know and certainly wouldn't have believed it someone tried to tell me that, The Achieva won the touring car championship of the SCCA World Challenge from 1992-1994. As of 2011, Oldsmobile is the only GM division to accomplish this feat and only one of two American brands (along with Eagle). Sorry, just thought that was strange being a member of the SCCA. So, now back to work...>
It will start and run rough for proximately 2 seconds and then die after I keep cranking it it fuel fouls the plugs out it will not start at all then. I will then unplug the relay for the fuel pump and crank it until it purges the cylanders and then hook it back up and then it will start again and fuel foul the plugs immediately. This problem happened all of a sudden, it does try to start though so I know I'm getting fuel in fire I just don't know if it's the right proportion or not. Could we be looking at spark timing? By the way, thank you all for you're posts! !!
Thank you for more good info, that's more than most. I have the diagram for the fuel system, but I just got a call from my elderly mother and she needs help and groceries. So, for now I have to go, but I will be back and we'll figure this out, I hope this isn't your daily driver and you needing a fast fix, if that's the case well I don't know what to do for you at the moment as I do have to take care of Mom, I'm sorry but will be back in about three hours or so and I am West coast time and it's about 12:30 pm. So when I get back I have some ideas.
The fuel pump pressurizes the fuel rail. The Fuel pressure regulator drops it down to 45 PSI. At start, the injectors see full pressure from the pump. As soon and the engine starts, there is vacuum and the regulator drops the pressure. --- to test the regulator, get a couple foot of clear 1/4" aquarium tubing. Put one end on the regulator and suck on the other end. If you see gasoline in the tube, replace the regulator. --- For more info on the care and feeding of the 2.4L engine, go to GAOwnersClub.com
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