Author Topic: no injector pulse  (Read 2739 times)

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Offline billy

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no injector pulse
« on: August 29 2022, 06:04:55 PM »
hello guys , i recently purchased an 87 t-type that had been sitting many years from a friend . i changed the plugs , wires , fuel pump assembly and put new fuel and i cleaned the fuel injectors , to my surprise it started right up for about 20 minutes at idle good oil pressure , fuel pressure everything was looking good then it just died and wouldn't crank back up . i waited 10 minutes and it started for about 10 seconds and died , so i gave up went to eat came home and gave it 1 more try , it started for about 20 seconds this time and died and hasn't started since . what i have found is i have spark  , and plenty fuel pressure but no injector pulse . i followed the trouble shooting for no start and i keep seeing i should have 6-9 vols when checking voltage at the crank and cam sensors well i'm only getting 3.9 volts , also i did the check where you jump cam shaft sensor and put volage to pin c momentarily at ignition modue and the light at injector flashed everytime , heres where i get lost it says unplug cam sensor and jump b and c pins then momentarily jump b and c at crank and injector light should light up well it doesnt ! i ordered a new ecm but now im second guessing that it could be crank sensor , cam sensor or ignition module , im not worried about ordering the ecm i figure it will be good to have an extra laying around . PLEASE HELP and THANKS IN ADVANCE !
« Last Edit: August 29 2022, 06:19:22 PM by billy »

Offline Steve Wood

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Re: no injector pulse
« Reply #1 on: August 29 2022, 06:32:30 PM »
https://www.vortexbuicks-etc.com/troubshootgeneral.htm

Cam sensor or ecm.  Read the bottom of the page about short cuts before going to the trees


Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline billy

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Re: no injector pulse
« Reply #2 on: August 29 2022, 07:37:26 PM »
Thanks

Offline SuperSix

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Re: no injector pulse
« Reply #3 on: August 29 2022, 11:29:16 PM »
Welcome to the board, Billy. Bookmark the Vortex site, it's an indispensable tool.
'87 GN, 60lb, TA49, THDP, FTP cam, T+ lots o' shit - SOLD
'07 Ford F150 Lariat 2WD, 5.4L 3v - 255k
'20 Kubota BX2380. FEL, 60" deck
'78 IH/Case 184 Lo-Boy
'99 Kawasaki Bayou 400 4x4

 

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