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454 Fuel Problem |
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Romeo 
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Joined: 16 November 2008 Location: Canada Status: Offline Points: 3033 |
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 Posted: 18 September 2011 at 6:52pm |
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Actually, tied in with what you suggested, it has a low TPS Sensor code as well. So if the MAP is conversely being read "high" compared to the TPS, that could be it. Will try that tomorrow. Finally having given up tonight... I'm frustrated as hell. Don't want to look at that stupid thing anymore. |
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Never shift into reverse without a back-up plan.
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Dr.Fiero
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Joined: 12 February 2007 Location: Canada Status: Offline Points: 1726 |
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Posted: 18 September 2011 at 7:36pm |
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Do you not have an OBD-1 scan tool?
If you have access to one - Hook it up, and see what the MAP voltage is. With the engine off, you should see almost 5 volts (anything like 4.3 or more is fine). If you had high vacuum (~19-21 inches) while it was running, you'd see about 1.4 volts. |
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Romeo
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Posted: 18 September 2011 at 7:53pm |
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I have a scan-tool, but I only get PIDs on OBD-II vehicles with it, OBD-I is just codes (It's a dumb design).
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Never shift into reverse without a back-up plan.
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Dr.Fiero
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Posted: 18 September 2011 at 8:25pm |
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Not sure who's got it, but the Pro-Link 9000 that the club has does what I'm talking about. Pretty sure the module covers your year (mine does).
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Romeo
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Posted: 18 September 2011 at 9:39pm |
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Alrighty, will have to talk to David next weekend then. Thanks for the advice!
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Never shift into reverse without a back-up plan.
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Patrick
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Joined: 19 April 2008 Location: Vancouver Status: Offline Points: 6 |
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Posted: 19 September 2011 at 12:20am |
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Tristan, I have it on good authority that a shiny new gas cap will restore your truck as well as brighten your smile.
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Romeo
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Posted: 19 September 2011 at 3:12pm |
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Gas cap seems relatively minor now, seeing as how I spent this morning saving my K&N from a small engine fire, burning my hand in the process. Ok, now I'm fairly certain it is a fuel issue. |
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Never shift into reverse without a back-up plan.
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Patrick
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Joined: 19 April 2008 Location: Vancouver Status: Offline Points: 6 |
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Posted: 19 September 2011 at 6:06pm |
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All of us who own Fieros (them things catch fire, you know) should always have a fire extingusher near by. How's your hand? Shall we now refer to you as "Lefty"?
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Romeo
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Posted: 20 September 2011 at 8:33am |
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It's not burned that bad, just blistered. And I did have a fire extinguisher on hand, but because the fire was inside the throttle body - which was inside the K&N - I ditched the extinguisher to save the air filter. Didn't think of the fact I still had fuel on my right hand from working on it earlier. lol
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Never shift into reverse without a back-up plan.
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CFoss
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Joined: 13 February 2007 Location: Canada Status: Offline Points: 580 |
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Posted: 20 September 2011 at 2:11pm |
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I sent the club a winaldl cable which should work for your application, only it has a 10k resistor so it will enter aldl mode when you connect it.
Choose 16144288 for the ecm...i know it's not right, you probably have a '7747, but it will work for checking the sensors. If you want to build your own cable, the one or 2 transistor method will work (I've only used the 2 T cable, so I'd suggest building it):  Ignore the lotus end, just find +12, gnd from anywhere (Cig lighter for temp, I wired mine in solid on my boat which uses a '161 1992 TBI), then find the data out and connect it. Chay |
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86 SE 3.4
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Romeo
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Joined: 16 November 2008 Location: Canada Status: Offline Points: 3033 |
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Posted: 20 September 2011 at 2:39pm |
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I know my scan-tool uses "Printer" connectors (About the best way I can describe them. They're the same size and pin-count as old-school dot matrix printer connectors were) to go from the tool itself to the adaptor. I wonder if I downloaded WinALDL and found a "Printer-to-USB" adapter if I'd even have to build the cord... Oh well, just picked up the new throttle body ($500 later...) so I'll head out and pop that on first, then I'll see if I need to keep scanning. |
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Never shift into reverse without a back-up plan.
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Patrick
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Posted: 20 September 2011 at 2:51pm |
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... Hope that solves the problem!
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Romeo
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Posted: 22 September 2011 at 3:51pm |
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If it doesn't, next step is a carb, and a very clever job disguising it from ICBC.
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Never shift into reverse without a back-up plan.
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karnak
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Joined: 28 August 2009 Location: Canada Status: Offline Points: 349 |
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Posted: 22 September 2011 at 10:19pm |
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I am pretty sure i have the transistors and such if you want to build
the cable.. |
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Romeo
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Posted: 23 September 2011 at 3:15pm |
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I might, Gary. Just give me a little bit. My hand has healed up enough where I don't think it'd hurt to try and install the new TBI, so I'll head out and do that today and tomorrow (As well as to check what else was damaged). If it still struggles with fuel modulation, I will send you a message. Thanks a lot for the offer! |
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Never shift into reverse without a back-up plan.
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Romeo
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Posted: 05 October 2011 at 5:30pm |
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Update: It's working. Although I must admit, every now and then it has trouble idling (Although usually it runs flawlessly). I think it may be a vacuum leak, as, on top of those conditions, the transmission usually shifts late and hard (Which would imply the modulator isn't seeing enough vacuum). (Happy now, Patrick?) |
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Never shift into reverse without a back-up plan.
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Dr.Fiero
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Joined: 12 February 2007 Location: Canada Status: Offline Points: 1726 |
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Posted: 05 October 2011 at 5:51pm |
Is it a 700R4 tranny? If so - no vac' mod. Your throttle valve cable is not set right. It'll probably be one or two 'clicks' too tight (tranny thinks you're stepping on it harder than you are). |
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Romeo
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Joined: 16 November 2008 Location: Canada Status: Offline Points: 3033 |
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Posted: 05 October 2011 at 7:59pm |
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Hm, according to the interwebz, I have a 4L80-E. And I was fairly sure there was a vacuum leak somewhere, just thought it made sense for that condition to solve both symptoms. |
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Romeo wrote:
