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Type: Posts; User: GetItBilly

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  1. Replies
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    Just to close this thread out, after going...

    Just to close this thread out, after going through the code 42 troubleshooting steps, I put the original ECM back on and mailed the reman'd one back to ACDelco. No more code 42 after that. Engine is...
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    So I haven't really started troubleshooting the...

    So I haven't really started troubleshooting the code 42, but now I'm wondering if I should go straight to swapping the "new" reaman'd ECM out for the original. I ask because most recently, while the...
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    Thanks for the help! I knew I'd probably have a...

    Thanks for the help! I knew I'd probably have a few more things to work out after this, though. Now the truck throws code 42 for the EST wiring after idling for 4-5 mins. I'll have to go through that...
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    It had the wrong injectors! Got new 61 lb...

    It had the wrong injectors! Got new 61 lb injectors installed and the top end of the TBI rebuilt. I could immediately see a huge difference in the size of the spray pattern coming out of the new...
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    I don't want to jinx myself, but let's say the...

    I don't want to jinx myself, but let's say the injectors don't help, so then I take the valve cover off, measure rocker lift and find out I have an aftermarket cam? Do I have any options other than...
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    Yup, the TBI (17087020) is appropriate for an 87...

    Yup, the TBI (17087020) is appropriate for an 87 Truck. (http://www.carburetion.com/CarbNumber.asp?Number=17087020). I read around a bunch and 61 lb injectors should be the right ones for 5.7 truck,...
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    Maybe the blue color on the injectors isn't as...

    Maybe the blue color on the injectors isn't as meaningful if they are aftermarket, but the only OE injectors I can find that would have had blue on them were either for a 4.3L or a big block. Looks...
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    I didn't know what a prom broadcast code was...

    I didn't know what a prom broadcast code was until after I installed the ECM, but I did write down what is apparently the Prom ID (3542) and, according to this site, it's correct for the truck:
    ...
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    Thanks, guys. myburb - yes, both injectors are...

    Thanks, guys.

    myburb - yes, both injectors are spraying. I've taken the timing light to them and don't see any big drops, either.

    donf - Thanks, I will check out the manual. I already have the...
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    The only way I can get a steady rpm is by either...

    The only way I can get a steady rpm is by either unplugging the electric connector from the map sensor or removing the vacuum hose from the map sensor - both of which, I assume, force the ECM into...
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    Other thing to add is that when the rpms start...

    Other thing to add is that when the rpms start dropping and cycling back up when I hold the throttle at higher rpms, live data seems to show that IAC isn't moving, so I guess it's the timing getting...
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    New ECM did not change behavior, it was worth a...

    New ECM did not change behavior, it was worth a shot for $15.

    With tan/black wire disconnected, max engine vac was achieved around 10-12 degrees advanced. But, per info on the truck's shroud,...
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    Sorry, either I'm totally missing something or I...

    Sorry, either I'm totally missing something or I didn't explain what's happening in the video clearly. What I intended was to ask if I can focus on investigating a (hopefully) short list of specific...
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    Cats are long gone on this truck. I'll try the...

    Cats are long gone on this truck. I'll try the TPS idea next when I have time.

    I guess one thing I could use some opinions on is what that video I posted proves. Could a vacuum leak still be a...
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    https://www.youtube.com/watch?v=33L2AwntWlE ...

    https://www.youtube.com/watch?v=33L2AwntWlE

    Thanks for the feedback, 1project2many.

    I think my map sensor is providing the proper readings. Video above shows map sensor voltage, vacuum tee'd...
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    Yeah, sorry, I meant the problem I want to solve...

    Yeah, sorry, I meant the problem I want to solve is why does vacuum / timing advance momentarily but repeatedly drop when I raise rpms above idle and hold it there (while in Park)? My truck does have...
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    Getting owned by an 87 TBI

    First, thanks in advance for all the helpful information on this forum. I've got an '87 GMC V2500 w/ HD option. It stumbles and bumbles under load. I've googled the hell out of my issues and below is...
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