QuestionQUESTION: can a bad fuel pressure regulator cause a no start situation? Was very hard starting when cold but now wont start at all even when warm {50 degrees} got spark and seems to want to start but doesn't no fault codes.seems like it floods as soon as it trys to start.Fuel pump is fine.
ANSWER: Hi Randy,
Sure it could, but it would be good if you could verify the pressure is 'off' before replacing it. May I suggesta an alternative? Take a look at the egr valve to see if it might be stuck slightly ajar. It is located in a small pipe that branches off the right side exhaust manifold and routes back to the intake manifold at the rear of the engine. The valve has a round top with a vacuum line, and flange area between it and the valve body mounted in the pipe. Inside the flange look to see the valve stem which has a circumferential slot. Use the tip of screwdriver in the slot to move the stem back and forth against spring-action in one direction that attempts to close the valve. Make sure that it closes to a dead stop by means of the spring. If it doesn't or appears to move with a lot of friction, then spray some WD-40 on the stem where it enters the valve body, work it some more back and forth, then see if it will start well. Such a partially ajar valve will prevent starting due to the leaning out of the mixture that is causes.
And there is no fault code that detects that problem. I assume that you do get a code 55 when you try for fault codes, otherwise, you haven't done the key switching correctly.
Roland
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---------- FOLLOW-UP ----------
QUESTION: while trouble shooting yesterday i noticed that the fuel pump does not prime every time you turn the key on no real pattern to it just sometimes will prime and sometimes not.is this normal?as for the egr valve ,it has a rubber diaphragm and a spring but nothing solid that moves.
thanks
Randy
AnswerHi Randy,
On the fuel pump, that is not normal. With a helper, check to see if the fuel pumnp relay clicks on and off when he first turns the key to 'run'. It should do that; if not then see if fuse #18 behind the dash left end cap is reliably powering up when you put it in 'run' and if that were not then the contact in the ignition switch may be oxidized and could be helped by a squirt of elelctronic circuit cleaner in a spray can with straw applicator inserted in a hole/crack of the ignition switch. The voltage output is a dark blue wire from the switch to the fuse and then from the fuse to both the engine controller & pump relay.
On the egr, you may be looking at the egr solenoid/transucer rather than the valve itself. Follow the vacuum hose to find the valve mounted horizontally in the small side pipe off of the exhaust manifold, directly under the throttle body area. Then look for the valve stem in that item.
Roland
PS Please 'rate' my answer.
