At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
97 gmc safari van tpi what's the fuel pressure to b I have a weak injector pulse n won't start when cranked add starter fluid n it turns on n runs good what's the problem
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Is that static pressure with key on, engine off? Or engine running pressure? Both should be near 60, usually key on, engine off pressure will be about 3 or 4 psi higher.
If it runs good after starting, the injector pulse must be good. No reason why starting and running pulse should be different. Only difference is when running, fuel pump power is kept on by the oil pressure switch, whereas in starting, the fuel pump relay keeps the pump on. Very unusual, let us know. Measure voltage at one of the injector's power wire with key on. It should be battery voltage or very close.
if it starts with starter fluid then its a fuel problem. check the fuel pressure and volume with a gage. these require at least 56lbs pressure to open the injectors and if the pressure is at 52lbs the they will not open. these use the pressure to open the poppet injectors and have a problem with the spider lines cracking and leaking fuel inside the intake. this is probably why it won`t start on its own.
If it is a V6 fuel injected then either your injector heads and fuel lines may be clogged, go by a container of cleaning fluid for your injector heads, not the one for fuel lines. The one for injector heads will clean both. just pour it into your gas tank and let it sit for five mins then start your vehicle and run for five more mins. Let me know if this solves your problem.
Fuel pump relay may be weak. Try removing the connector from the oil pressure switch and connecting the terminals together so as to bypass the switch.
if this works, replace the relay.
Sometimes when battery voltage is lost, some modules may have to be reprogrammed or relearn? Do you have a security system?
You could always check the basics, have a helper crank it while you check for spark at the plugs. Also, check proper fuel pressure and fuel injector pulse. Let us know what you find?
Replace the FUEL PUMP RELAY. Its located in the under hood relay center. This relay primes the pump with the key on, about 2 seconds, then the pump will not run until the engine has oil pressure, then the fuel pump is energized.
×