2006LS2TB Posted March 8, 2006 Report Share Posted March 8, 2006 I have a 91 chevy 3500 with a 350 in it. I rebuilt the motor last year, with no major problems. Now, there's something holding the engine back and I can't figure out what it is. It's like it doesn't want to rev past 2500 rpm's. It will but it doesn't like it. It's a stock rebuild except for headers and K and N filter. I've tried everything I know to try, including retarding the timing. Any suggestions. Link to comment Share on other sites More sharing options...
misterp Posted March 8, 2006 Report Share Posted March 8, 2006 Is it sluggish to 2500, or makes good power down low and then tops-out at 2500? And does it miss or run smooth? Link to comment Share on other sites More sharing options...
2006LS2TB Posted March 8, 2006 Author Report Share Posted March 8, 2006 Is it sluggish to 2500, or makes good power down low and then tops-out at 2500? And does it miss or run smooth? <{POST_SNAPBACK}> Runs good down low and runs smooth. Even when I try to go past 2500 rpm its still smooth just doesn't want to rev. Kinda like its not getting enough air or something. Link to comment Share on other sites More sharing options...
misterp Posted March 8, 2006 Report Share Posted March 8, 2006 Is it sluggish to 2500, or makes good power down low and then tops-out at 2500? And does it miss or run smooth? <{POST_SNAPBACK}> Runs good down low and runs smooth. Even when I try to go past 2500 rpm its still smooth just doesn't want to rev. Kinda like its not getting enough air or something. <{POST_SNAPBACK}> Either that or it's way low on power (running super lean or rich?) Try a quick drive around the block without the air cleaner and mufflers. OHHHHHH hey I just got an idea, maybe plugged catalytic converter? Mr. P. Link to comment Share on other sites More sharing options...
Bowtie70SS Posted March 8, 2006 Report Share Posted March 8, 2006 Bad control module, clogged cats, bad MAP sensor? Link to comment Share on other sites More sharing options...
CoolBlueSS Posted March 8, 2006 Report Share Posted March 8, 2006 Does it matter if it's cold or hot? Does it worsen as it heats up? Sounds like module, coil, or converter. Possibly weak fuel pump or pressure regulator. Link to comment Share on other sites More sharing options...
jboyss Posted March 8, 2006 Report Share Posted March 8, 2006 maybe bad fuel injectors sounds like it might not be gettin enough fuel, is it stalling or bogging out when you rev it? Link to comment Share on other sites More sharing options...
Brandon27 Posted March 8, 2006 Report Share Posted March 8, 2006 Could even be something with the tranny. Brandon Link to comment Share on other sites More sharing options...
WI_Dave Posted March 8, 2006 Report Share Posted March 8, 2006 I would check fuel pressure. then filter or pump. Link to comment Share on other sites More sharing options...
zippy Posted March 8, 2006 Report Share Posted March 8, 2006 plugged cat or fuel pressure is about all i can think of. well, you might also want to check the pick up coil in the distributor. Link to comment Share on other sites More sharing options...
2006LS2TB Posted March 8, 2006 Author Report Share Posted March 8, 2006 I don't have any cats on the truck cause I don't have to have it inspected. It's also a manual, I'll check the fuel pressure though. Thanks Link to comment Share on other sites More sharing options...
tawss04 Posted March 8, 2006 Report Share Posted March 8, 2006 Check to make sure you are getting a good vaccum to the map sensor, I've seen the T/B ports get clogged with carbon. Check fuel pressure like they said before, it should be between 9-13psi, I have also seen the short peice of hose that connects the fuel pump to the sender in the tank go bad and cause a low fuel pressure concern. With out any scan tool data it's a little difficult to diagnose, it could be alot of things, this isjust some of the more common things I have seen on those trucks with that type of concern. Hope this helps Link to comment Share on other sites More sharing options...
2006LS2TB Posted November 13, 2006 Author Report Share Posted November 13, 2006 Back from the grave.LOL I finally figured out the problem.. Clogged fuel filter Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.