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Old 10-09-2006, 15:42   #1 (permalink)
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88 bronco fuel injection problem

Hey everyone I have a 88 bronco with a 302. The truck was given to me by a friend, it had been sitting for 2 years because it wouldnt start (figures). I started with the usual suspects, the fuel pump and checking for spark..had both. The fuel pump was not coming on with the key so i jumped the relay and that worked and what ive come to conclude is that It has good fuel pressure at the test point and it has spark because it will start for a second with starting fluid. The problem is the injectors are not pulsing and I dont understand why. Ive also changed the computer and the control module from a running parts truck and that didnt cure the problem. There is 12 volts at the injectors too but theyre just not firing. I could guess a sensor but I dont know where to start. Any ideas guys?
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Old 10-09-2006, 19:07   #2 (permalink)
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Re: 88 bronco fuel injection problem

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Originally Posted by mrsoultheloner
Hey everyone I have a 88 bronco with a 302. The truck was given to me by a friend, it had been sitting for 2 years because it wouldnt start (figures). I started with the usual suspects, the fuel pump and checking for spark..had both. The fuel pump was not coming on with the key so i jumped the relay and that worked and what ive come to conclude is that It has good fuel pressure at the test point and it has spark because it will start for a second with starting fluid. The problem is the injectors are not pulsing and I dont understand why. Ive also changed the computer and the control module from a running parts truck and that didnt cure the problem. There is 12 volts at the injectors too but theyre just not firing. I could guess a sensor but I dont know where to start. Any ideas guys?
The injectors may be frozen , if you are sure the electrics are good then pull the injectors and soak them over night in cleaner , then apply 6 volys or so and blow air backwards through them , ( about 10psi should do) they should click open and the rubbish will clear back , now install "oring" kits and reinstall , should now work ... good luck
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Old 10-10-2006, 03:04   #3 (permalink)
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Re: 88 bronco fuel injection problem

A mechanic told me that the EEC isnt firing the injectors but I cant figure out why. Im going to try the TPS next. If that doesnt work Im gonna take off the EFI and make it carburated. Its been done before and it always works.
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Old 08-15-2009, 17:41   #4 (permalink)
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Re: 88 bronco fuel injection problem

I had the same problem with my 89. I found a ground wire disconnectd at the battery There was the main wire and two smaller ones. one of which was corroded and wasn't making connection. it grounds out the fuel pump relay system.
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Old 08-16-2009, 10:11   #5 (permalink)
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Re: 88 bronco fuel injection problem

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...Im gonna take off the EFI and make it carburated. Its been done before and it always works.
That's about as sensible as "I got a flat, so I'm gonna switch to solid rubber tires!"
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Im going to try the TPS next.
Why not TRY a little diagnosis??? Do you have a Haynes manual & a cheap digital multimeter? Even if you have to buy them, it's cheaper/quicker/easier/smarter than a carb swap.
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