|
|
Post by xceler8 on Mar 26, 2005 20:40:18 GMT -5
Hello all, quick question. I have a 3/4 ton 87 chevy 350tbi 4x4, and it is having a starting problem. You have to click the starter 3 times before it starts. Its not the injectors, or fuel pump. A mechanic told me maybe the computer? After 3 clicks it will finally start. I am stumped.
|
|
|
|
Post by 19_Chevelle_69 on Mar 27, 2005 11:50:28 GMT -5
Is the starter actually turning the engnine over? Or is it like the starter just click-click-click, then it will turn the engine over?
I would suspect the starter solenoid is toast. The computer doesn't control cranking on your truck.
|
|
|
|
Post by xceler8 on Mar 28, 2005 20:29:49 GMT -5
well chevelle, it isnt the starter because it cranks over. its like it doesnt get the appropriate amount of fuel like the injectors are bad. we have gotten new ones. The are sending out the correct voltage. It is 3 short cranks for it to fire?
|
|
|
|
Post by 19_Chevelle_69 on Mar 29, 2005 20:15:45 GMT -5
Ahh, OK. I had to determine if you had a "crank-no start" or a "no cranking" problem.
The next step would be to check the fuel pressure. Low fuel pressure can be related to a weak fuel pump, or even on old fuel filter. Your friend said it's not the pump, but even if you can hear the pump run, it doesn't mean that it's not weak. The only sure way to tell is by doing a pressure test. The TBI system is pretty reliable, and usually if the engine will run, the computer is usually OK.
There are several things that can cause a delayed start or extended crank condition, let's check the easy ones first.
Try this ... find the smaller of the 2 fuel lines off the TBI follow it down till you find some neoprene hose and crimp it shut.. now go drive it. If it runs o.k. I would then start looking at fuel pressure. It should be 9-13 lbs or so (you have to have the proper tester and you hook it up at the fuel filter) no specs on dead head preasure ( return line blocked), but I would expect to see 25-30 lbs. If the pump is capable of pushing that, and it starts easily with the return line blocked, put a new fuel filter and pressure regulator on it. Early TBI pressure regulators were not uncommon to fail, bleeding off too much fuel.
|
|
