IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: dyermullet on February 27 2014, 10:17:51 AM
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All,
I need help with some common no start things to check on my car. I just moved and am still unpacking my stuff (manuals wiring diagrams and tools), don't have internet access at home yet, and have not had much chance to troubleshoot the car yet.
87 TR
factory ecu, TT chip (does not have no start feature), all stock style setup maf etc.
Car started fine drove onto trailer, towed it to my new place, started fine drove off the trailer and parked it next to my garage. I put enough things away in the garage the next day to make room for the car and now it will not start.
The battery is good, starter is good engine cranks over, and can tell it has compression from the sound. When I turn the key on the fuel pump does not run, so I thought maybe pump or relay was bad so I hot wired the pump. With the pump hot wired it runs and I can hear the fuel flowing through the fuel rails. Then when I tried to start still nothing. So either the injectors are not firing or no spark or both. I checked the fuse labeled ECM (with a meter)it is good. The ground to the fuel pump is good I only had to hot wire the positive side.
When I get my timing light unpacked I will attach it to a plug wire and see if I have spark or not. I have not had time to use my meter to start checking for power everywhere.
So with that back story I need some common causes to look for that would prevent the fuel pump from running and either no spark or no injectors firing. My gut feeling is either positive power supplied to the ECU or a ground that is common to fuel pump relay and computer, ignition etc.
Thanks in advance for any help.
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did you check the fuel pump/injector fuse in the fuse block?
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That was the problem. 15 amp fuse for fuel pump/injector was bad.
Thanks Steve.
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now you need to find out why...because it will probably do it again
two most likely culprits are the wiring harness going down the front passenger side of the engine to the oil pressure sending unit or the fuel injector harness is rubbing something around the egr valve or the coil bracket
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Dang Steve beat me to answer I was sure of :hmm . Lol. One day this newby is gonna beat ya to the punch...haha :cheers:
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Old and slow as I am, that should be easy! When it pops again, you can tell him what to check :D
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now you need to find out why...because it will probably do it again
two most likely culprits are the wiring harness going down the front passenger side of the engine to the oil pressure sending unit or the fuel injector harness is rubbing something around the egr valve or the coil bracket
I will check on both but my money would be on the oil pressure switch. Plug is falling apart I already have a replacement from caspers and was planning on replacement.
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I would guess that myself...