http://www.gmt400.com/forum/ en Wed, 08 Sep 2010 17:32:36 GMT vBulletin 60 http://www.gmt400.com/forum/images/Darkness3/misc/rss.png http://www.gmt400.com/forum/ http://www.gmt400.com/forum/showthread.php?1862-97-5.7-miss-fire-code-on-1-HELP&goto=newpost Sun, 05 Sep 2010 15:09:20 GMT I am new here Hi everyone. First the truck start it miss and get worse over a short time. Changed cap rotor plugs wire. Then one morning it started... I am new here Hi everyone. First the truck start it miss and get worse over a short time. Changed cap rotor plugs wire. Then one morning it started to really miss and the service light would flash as i drove it still missing then at idle stop flashing. Local shop scaned it said miss fire on #1 an need poppet. I bought the whole spider upgrade unit borg warner 63886 and replaced it. I is still doin gthe same thing missing and lacking power flashing. I pulled the number 1 plug looks good no soot oil little gas smell. Witht the truck running you get a rich exhaust smell. It has no cats on it. Auto 4x4 1997. I am at my wits end they were going to charge me 600 to replace A poppet i bought the spider complete for 304. But it still misses flashes and lacks power not a real big change the performace after the spider change to the new style? I am at a loss:hmm: ]]> Engine Performance + Maintenance shock http://www.gmt400.com/forum/showthread.php?1862-97-5.7-miss-fire-code-on-1-HELP http://www.gmt400.com/forum/showthread.php?1860-what-are-some-signs-of-a-cracked-head-or-valve-issues&goto=newpost Sun, 05 Sep 2010 03:34:42 GMT I got a question for all of you out there... what are some signs of a head with a crack in it or maybe burnt valve, bent valve, too tight, too loose.... I got a question for all of you out there... what are some signs of a head with a crack in it or maybe burnt valve, bent valve, too tight, too loose. I ask because I see alot of ppl talk about tbi heads cracking and such, and can be missed by the eye and such. I don't have collant lose or oil in the rad or anything. It kinda scares me though wondering lol.

I get a miss or pop out the ps exhaust, I got duals so I know it's that side ONLY, ds is fine. It's done it since the motor has been put back in, runs and drive fine, just has a cold start miss and pop and warm too I think still does it. I'm thinking of hopeing maybe wires? I got new dist. completely new one, new coil, they are accel wires and new plugs, new motor, well rebuilt and the valves got cleaned up with a wire brush on a drill and some valve grind compound put on them and spun in the drill, my old man did it, he's done it that way fr years. Is there a for sure way to know if it's valve? Like leakdown or compression test? I don't have a cylinder leak down tester but I do have a compression gauge. I also plan to do a running valve adjustment on it. I've had it in the truck for about a year and half now, and only drove it for less then a year, probably not even 500 miles on it.

I'm really hoping it's not valve or head related because if so it's gotta come apart and it'll be parked for awhile and not on the road or put together forever cuz of my tight budget.

I'm gonna try the valve adjustment and yank some wires off another 305 or 350 motor and try them. I can yank em off my brother in laws monte carlo(my old one) since it's here at my place and I'm working on it for him. I guess afterwards maybe do a compression test.

The valves were spotless though, but I guess anything can happen. it's a stock replacement flat tappet cam too from northern. Brand new lifters as well as everything else in side minus rods, pistons and crank.

New 02 as well and has headers, shorties that do not leak anywhere, AIR pump and lines have been removed and cats were gone before I got it.

Every other motor I built and did heads the same way and reused them never had this happen, but this is my first computer controlled build the rest were all carbd motors and still run great. ]]> Engine Performance + Maintenance Swims350 http://www.gmt400.com/forum/showthread.php?1860-what-are-some-signs-of-a-cracked-head-or-valve-issues http://www.gmt400.com/forum/showthread.php?1859-first-post-94-suburban-no-power-to-fuel-pump-fuse-and-relay-not-clicking&goto=newpost Sun, 05 Sep 2010 01:39:28 GMT Hey guys new here and i got some crappy wiring diagrams that don't show me where the fuse is in relation to the relay. Can anyone tell me if the fuse is before or after the relay? I got this thing on the cheap (damn near stole it) because it wasn't starting. I dumped fuel down it and she started right up. I thinking its the relay but when I disconnect it all I can get from the connector is the constant 12v from the red wire with the ignition key on or off

any other suggestions or am I right? ]]> Engine Performance + Maintenance bldgengineer http://www.gmt400.com/forum/showthread.php?1859-first-post-94-suburban-no-power-to-fuel-pump-fuse-and-relay-not-clicking http://www.gmt400.com/forum/showthread.php?1843-1995-TBI-350-EGR-Solenoid-Question&goto=newpost Fri, 03 Sep 2010 02:23:57 GMT Just noticed that only the bottom port on the left side has a vac line attached and was wondering should the upper port on the left side also have a... Just noticed that only the bottom port on the left side has a vac line attached and was wondering should the upper port on the left side also have a vac line attached.

]]> Engine Performance + Maintenance Bigg G http://www.gmt400.com/forum/showthread.php?1843-1995-TBI-350-EGR-Solenoid-Question http://www.gmt400.com/forum/showthread.php?1841-truck-not-burning-gas-fast-enough&goto=newpost Fri, 03 Sep 2010 00:40:28 GMT my truck is dumping to much gas and it doesnt burn it fast enough so what could be the problem my truck is dumping to much gas and it doesnt burn it fast enough so what could be the problem ]]> Engine Performance + Maintenance chevyon22s http://www.gmt400.com/forum/showthread.php?1841-truck-not-burning-gas-fast-enough http://www.gmt400.com/forum/showthread.php?1837-Nitrous-Solenoids-Locations&goto=newpost Thu, 02 Sep 2010 16:25:07 GMT Hi I was just wondering if anyone has some pictures of where they mounted nitrous solenoids? My directions say to mount them on these cheep brackets... Hi I was just wondering if anyone has some pictures of where they mounted nitrous solenoids? My directions say to mount them on these cheep brackets they supplied and then to mount them to the throttle body. I think it will look half a** if i do it that way. I am thinking about doing somthing on the firewall. Maybe use some polished aluminum angle iron. ]]> Engine Performance + Maintenance asolek88 http://www.gmt400.com/forum/showthread.php?1837-Nitrous-Solenoids-Locations http://www.gmt400.com/forum/showthread.php?1830-Why-can-t-i-do-this&goto=newpost Thu, 02 Sep 2010 00:41:59 GMT This came to me while i was wrenching the gas tank off a junkyard truck. Why can't i put a fuel pump right in the frame and run a line to the tbi and have it work? this setup would be much easier to work on opposed to the in-tank pump. i know this is the way it was with carbs but why can't it work on tbi? i figure sa long as there is a pump to bring fuel from the tank to the tbi then it should not matter were it is at. as far as pressure goes, you could put a adjustable pressure gauge between the fuel line and tbi and then you can make it get the right pressure. most of my knowledge is motor and this is a area that i don't know much about, i have always thought that this is the way it is and it can't be different. so if someone can shed some more light on this that would be great. But if there is no reason why this won't work, i plan to make a trap door in my bed and put in a fuel cell and go the old school way of fuel delivery. ]]> Engine Performance + Maintenance barebones 1500 http://www.gmt400.com/forum/showthread.php?1830-Why-can-t-i-do-this http://www.gmt400.com/forum/showthread.php?1823-carbed-to-tbi-454&goto=newpost Wed, 01 Sep 2010 06:07:31 GMT Ok guys I posted a couple weeks ago about swapping a 350 into my dads 95 3500 2wd dually with a blown 454. I have a 71 chevy with a 454 and a guy... Ok guys I posted a couple weeks ago about swapping a 350 into my dads 95 3500 2wd dually with a blown 454. I have a 71 chevy with a 454 and a guy wanting to buy it without the motor. How hard and what would I have to do to make my carbed 454 work in my dads 95? We want to make the carb motor tbi. Thanks for the help! ]]> Engine Performance + Maintenance 93zierra http://www.gmt400.com/forum/showthread.php?1823-carbed-to-tbi-454 http://www.gmt400.com/forum/showthread.php?1816-ECM-I-20A-blown&goto=newpost Tue, 31 Aug 2010 23:21:39 GMT What would cause the ECM-I Fuse to keep blowing? Everytime i turn the ignition to the Start position the fuse blows. What should i be looking for and... What would cause the ECM-I Fuse to keep blowing? Everytime i turn the ignition to the Start position the fuse blows. What should i be looking for and where should i begin?

Causes the fuel pump to not turn on, and no spark. ]]> Engine Performance + Maintenance http://www.gmt400.com/forum/showthread.php?1816-ECM-I-20A-blown http://www.gmt400.com/forum/showthread.php?1806-PO420-code&goto=newpost Tue, 31 Aug 2010 00:26:27 GMT Anyone ever have the PO420 code on their 1996 chevy truck ? If so how did you fix it ? Anyone ever have the PO420 code on their 1996 chevy truck ? If so how did you fix it ? ]]> Engine Performance + Maintenance EMT96 http://www.gmt400.com/forum/showthread.php?1806-PO420-code http://www.gmt400.com/forum/showthread.php?1800-Can-I-remove-this-without-any-ill-effects&goto=newpost Sun, 29 Aug 2010 23:21:35 GMT When I replaced all my rotted out brake lines with all new stainless I discovered that I had a fuel line that ran from the tank to this Image:... When I replaced all my rotted out brake lines with all new stainless I discovered that I had a fuel line that ran from the tank to this




was completely rotted out and not even connected to the gas tank so I cut the majority of the line out. Can I just removed the whole damn thing since it isn't working? My truck is a 1991 so it doesn't require emissions testing. ]]> Engine Performance + Maintenance bizzo15 http://www.gmt400.com/forum/showthread.php?1800-Can-I-remove-this-without-any-ill-effects http://www.gmt400.com/forum/showthread.php?1794-Braking-woes&goto=newpost Sat, 28 Aug 2010 21:43:30 GMT Hey everyone,

Ever since I bought my truck (88 C1500) the brakes haven't been what they should be, and as of late the pedal would sink when I would be stopped. I figured either the bore of the master cylinder was pitted or the seals inside of it were warped/deteriorated so I bought a replacement master cylinder and installed it. I bench bled it and bled the brakes after installation, and took it for a test drive. I can push the brake pedal down now to probably 75% of its range before it starts braking, and it only has maybe 2 inches of travel from lightly braking to flooring the pedal. I just put in all new rotors, pads and calipers so the brakes are good, I panic stopped to test it and my sub box flew into my dash. So does anyone have any ideas why its so low now?

Thanks,

Josh ]]> Engine Performance + Maintenance 1500SS http://www.gmt400.com/forum/showthread.php?1794-Braking-woes http://www.gmt400.com/forum/showthread.php?1791-5.7-Vortec-Noise&goto=newpost Sat, 28 Aug 2010 15:26:29 GMT The other day while i was merging on the highway a car going about 80 was getting closing fast so i put it to the floor it down shifts the rpm go up... The other day while i was merging on the highway a car going about 80 was getting closing fast so i put it to the floor it down shifts the rpm go up to about 4800-5000
and it starts making this loud shhhhhhh noise then it up shifts back into OD and its at 2000 rpms still making this noise i then take my foot off the accelerator and the noise stops now when it gets up to 4000 or above it does it. the a.c was off and my truck also has 220000 ]]> Engine Performance + Maintenance 97c1500 http://www.gmt400.com/forum/showthread.php?1791-5.7-Vortec-Noise http://www.gmt400.com/forum/showthread.php?1774-Ok-I-Need-Help&goto=newpost Wed, 25 Aug 2010 04:28:26 GMT alright when i punch it itl cock sideways and take off spinnin then all of a sudden cut out for a sec then take off again like a bat outa hell idk... alright when i punch it itl cock sideways and take off spinnin then all of a sudden cut
out for a sec then take off again like a bat outa hell
idk what it could be

new plugs and button,cap is fairley new ]]> Engine Performance + Maintenance 1990GMCSIERRA http://www.gmt400.com/forum/showthread.php?1774-Ok-I-Need-Help http://www.gmt400.com/forum/showthread.php?1766-160-thermostat-or-180-thermostat&goto=newpost Tue, 24 Aug 2010 01:23:53 GMT I have both and i was just wondering if i put the 160 in my truck will it make it run like crap or too rich to rob gas mileage.I have a 350 tbi in my... I have both and i was just wondering if i put the 160 in my truck will it make it run like crap or too rich to rob gas mileage.I have a 350 tbi in my k2500 sub and i will be ordering a jet stage two chip to thow it the with the spacer.which one would be better 160 or 180 stock and chiped.And also do i have to realy run higher octane gas with the chip(i have a 32 gallon take)Sorry for the long thread thanks ]]> Engine Performance + Maintenance 4x4chevy http://www.gmt400.com/forum/showthread.php?1766-160-thermostat-or-180-thermostat