89 351 Windsor running problems

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Mar 19, 2020 | 03:05 PM

Cody Peterson

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89 351 Windsor running problems

I have a 89 f150 with a 351 Windsor efi the engine was rebuilt completely and the old owner had put a new cam in it not shore on what cam. I’m having problems with the truck not idling has new IAC new map new tp new fuel pump and pressure regulator. The truck won’t run at all with the fuel pressure regulator hooked up to vacuum and can’t get a steady idle the truck will lope really hard then die. I’ve done timing from the camshafts all the way to distributor I’ve replaced about everything no results also seems like it’s down on power

Mar 19, 2020 | 06:56 PM

torq'ta 5 8

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have you tried checking for codes, O2 sensor still installed, what is fuel pressure with a gauge
really need to get PO to find or remember what cam, they may not have known about SD in these trucks not liking lopy cams, did you check that TPS meet the minimum closed volts of 0.6 vdc
Fuel Injection Technical Library » Throttle Position Sensor (TPS)

Mar 19, 2020 | 08:05 PM

Cody Peterson

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Originally Posted by torq'ta 5 8

yea o2 sensor in still there the codes I got are a
12 34 81 82 and has 40 psi of fuel pressure with the vacuum to the pressure regulator if I hold a high idle

Mar 20, 2020 | 05:49 PM

torq'ta 5 8

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here is the list for codes, very good web site, wealth of info, to book mark, or add to favorites, right side of page list how to test, sensors and actuators, EGR, IAC-(if you unplug IAC does idle get worse or no change) could have vacuum leak, EGR could be gummed up not closing(bad/no idle) the code 34 is EGR function
Fuel Injection Technical Library » 2 Digit Self-test Codes 11-32
Fuel Injection Technical Library » EGR Valve Position sensor (EVP) <--shows how to test it
Fuel Injection Technical Library » Idle Air Bypass (IAB) <--same as IAC

Mar 20, 2020 | 09:52 PM

Cody Peterson

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Originally Posted by torq'ta 5 8

if I unhook the iac and idle it up I’d will run better and the truck holds 20 pounds of vacuum but if I don’t idle the truck up it will die out it gets really bad when put in gear the truck surges and bucks really hard then stalls out I’ve got it to idle better out of gear truck is automatic

Mar 21, 2020 | 07:46 AM

torq'ta 5 8

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it should try to die when you unplug it, tells me your IAC is working, have you cleaned it, tackle your EGR code, 2 bolts and its off use throttle body cleaner, or if you have PBlaster that does well also just dont use brake parts cleaner

Mar 21, 2020 | 01:17 PM

Cody Peterson

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Originally Posted by torq'ta 5 8

I got the egr code gone no difference on how it runs

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Mar 21, 2020 | 09:25 PM

Cody Peterson

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Quote:

Originally Posted by torq'ta 5 8

did you test that TPS was at least at minmum closed volts of 0.6vdc
Fuel Injection Technical Library » Throttle Position Sensor (TPS)

yes it is under 0.6 nothing seem to be making a difference

Mar 21, 2020 | 09:31 PM

#10

torq'ta 5 8

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that could be part of issue, should be no less than 0.6vdc when closed, you can adjust it to at least read 0.6vdc, that is what the PCM is looking for
Throttle Position Sensor Testing, Replacement and Adjustment - Ford Bronco Forum

Mar 23, 2020 | 08:58 AM

#11

Cody Peterson

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Originally Posted by torq'ta 5 8

ok I’ll idle it up to we’re it’s reading 0.6v again it was a little over 6 before and had the same problem

Mar 23, 2020 | 10:33 AM

#12

torq'ta 5 8

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did you find out what cam the PO put in?
when you checked timing what was it ?
how are you idling it up and down, the computer controls that with the IAC that you tested?

did you follow the instructions on the thread (link below)

Throttle Position Sensor Testing, Replacement and Adjustment - Ford Bronco Forum