Recent content by shortboxchevy77

  1. S

    Engine runs ehh not good

    Well, not everyone can have the experience and be good at it. In his case it's merely a means of diagnosing a problem.
  2. S

    Engine runs ehh not good

    Just so you know my 83 with a 305 has a slipped harmonic balancer, time it using the timing marks and it runs horridly. Time it by ear and its great, common issue with them.
  3. S

    Drain and fill plug seized on Np208

    put a wrench on it then smack the end of the wrench with a hammer, will come right off.
  4. S

    Pinging/knocking sound

    87 with TBI (if still all factory with TBI) has no Vacuum advance, all electronic. First thing to check is timing second to check is knock sensor. If it is pinging that hard and the knock sensor is functioning correctly it should have pulled all the time giving you a big loss of power while at...
  5. S

    RPM Fuel Mileage

    There is no way in hell his 4 wheel drive suburban with a 5.7 will pack itself efficiently at 70 spinning 1200rpm with a factory TBI unit. It's not as simple as lower rpm=less fuel consumption.
  6. S

    RPM Fuel Mileage

    between 2 and 2400 rpm at 70mph in my opinion. Any lower and you will burn more fuel working the engine outside of its power curve. I'm running 4.10's with 265/75R16 tires and with a 700R4 and turning 2500 at 75mph
  7. S

    Going to a 454

    So after installing 3/4 ton axles with 4.10 gears in Big Red it gets around pretty good and gets down the highway okay but I am still not happy with the power it makes, especially when I have it loaded down with a 4 wheeler and ice fishing stuff and bucking a wind going down the highway. Here is...
  8. S

    TBI low idle

    Best way to know for sure is to use a scan tool with live data ability to see what the ECM is seeing as far as the coolant temp is concerned. If it is maxed out at -40 that means bad sensor or lost connection. Another thing to try is using a small pick and bending the contact tabs back up...
  9. S

    Help me troubleshoot my TBI Issue

    The circuits go bad in them, they just go bad. You will need an ECM with a matching number, the number will be on a sticker on the outside of the ECM. If the ECM has the right number but came out of an auto just pull the chip access cover and install the chip from your ECM.
  10. S

    Help me troubleshoot my TBI Issue

    Sounds like a bad ECM to me, especially with it throwing an inlet air temp code since that system has no such sensor. They do really weird things when the ECM starts to go south. One test to try is to hold the ECM in your hand while its running and give the case a few good raps with your...
  11. S

    350 TBI 2k-3k RPM woes

    Yes I do. I used the speedo setup from the 87 donor suburban and have confirmed that it is reading with my scan tool. I'm now looking at turning the truck into a 4 speed to cure my unhappiness with its on the highway performance, or I may just sell it and buy a newer work truck that has AC...
  12. S

    350 TBI 2k-3k RPM woes

    No, that is not the issue, I wired it after getting tired of it constantly being unlocked just to keep highway speed. The converter locking has nothing to do with it. It just sucks trying to maintain over 70mph and its terrible on fuel doing it. I'm awful close to cutting my losses and getting...
  13. S

    carb suggestions for a 350

    You cant really go wrong with a Qjet, very reliable and not really that hard to rebuild once you tear one down.
  14. S

    Rebuilt motor brought truck in for exhaust work died on the way home...

    Unfortunately that oil pressure switch killing the fuel pump wasn't really designed to save the engine due to low oil, it was actually designed to stop the fuel pump from continuously running in the event of an accident. I've seen many TBI 350's seized due to the breaking of oil cooler lines or...
  15. S

    ECM question

    If I remember correctly it was the B and D terminals on the trans. plug-in. I'll confirm that for you in the morning. A very intelligent man who's been in the trans. business for a very, very long time told me to do this. He said a lot of 700R4's met their death due to not being able to go into...
See more

Latest posts

Forum statistics

Threads
42,356
Posts
914,272
Members
33,859
Latest member
Green K10
Top