Its an 89 Chevy 1 ton, 454 TBI. I am getting fuel to the injectors, so I know the fuel pump is good. If you prime the truck, it starts. Replaced the fuel pump anyways, just to be on the safe side, and the electronic computer control. I also replaced the fuel relay. Any suggestions?? I don't want to put this beast in the shop, but I got to get her running. I need this truck. Any suggestions would be helpful.
2007-06-20 16:58:02 · 8 answers · asked by Kalighe 3 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
What about spark? Is the ignition good? How good are the plugs? How is the compression? When did the truck last run?
2007-06-20 17:10:08 · answer #1 · answered by Fred C 7 · 0⤊ 0⤋
You have to continue to diagnose to find the problem and not just arbitrarily replace parts. Motors need compression, spark, and fuel to start. The newer ones also need a healthy PCM to time and deliver injector pulses to start. First things to do is to confirm fuel pressure which you say you have so as long as your fuel filter isn't plugged you should be okay. The next thing to check is for a strong and consistent spark output to EVERY cylinder. Check this by removing every spark plug wire at its spark plug and crank the motor over while you observe the output to ground. If the spark is strong and consistent for every cylinder, move on. If the spark is non-existent, weak, or inconsistent you have to chase back first for a secondary ignition problem. What you would be looking for here is corroded plug wires, corroded coil wire, corroded coil or cap connectors, insulation faults on wires, and carbon tracking on the plugs. If anything found here, repair and recheck. If you don't have any spark, you probably have an ignition module or pick-up coil problem inside the distributor or a worn out distributor. Use a test light connected to the white wire at the coil and turn the ignition on, the test light should light. Turn the motor over and the test light should blink. If something found here, repair and recheck. If all this is good, check the health of the PCM by checking for a check engine light and scanning for codes. Also should check for valid data. Once that is all confirmed, turn the motor over while observing engine speed in the PCM's data, it should have some value other than zero. If that is all okay, remove the injector connectors from the top of the TBI. Probe the connections with a test light to ground with the ignition on, light should light on one of each of the connectors. Install the test light across both of the two connectors to one of the injectors and turn the motor over, the test light should be blinking rapidly. If this is okay, check the resistance of the injectors as they may be open and thus not delivering fuel. There is a lot of info here and I am assuming that you have an idea of what I'm saying here to be able to use it. Good luck.
2007-06-21 14:34:11 · answer #2 · answered by Deano 7 · 0⤊ 0⤋
Why does everyone blame the fuel? Start with "the weakest link" The electrical.
2007-06-21 00:03:13 · answer #3 · answered by ButwhatdoIno? 6 · 0⤊ 0⤋
check fuel lines for air leaks. and make sure none of the mare clogged or twisted i na way that the fuel cant get through easily
2007-06-21 00:04:16 · answer #4 · answered by matt 2 · 0⤊ 1⤋
it sounds like your not getting much of a spark. it seems you have to put more and more gas for a small spark to ignite. check your plugs or your ignition.
2007-06-21 10:50:36 · answer #5 · answered by dustborn05 2 · 0⤊ 0⤋
check your wires on the TBI to see if they are hooked up and pulsing
2007-06-21 00:03:18 · answer #6 · answered by vincent c 4 · 0⤊ 0⤋
Check your oil pressure sensor if you have low oil pressure your truck wont start
2007-06-21 01:11:20 · answer #7 · answered by robert s 1 · 0⤊ 1⤋
look at the crank sensor they run most everything
2007-06-21 06:09:53 · answer #8 · answered by Anonymous · 0⤊ 0⤋