Hello Everyone, I have spent app 6 months trying to figure out the issue with my truck,I have spent hours searching. 1995 Chevy K1500, Extended Cab, 350 with TBI, 4L60E trans,234,000 miles, standard bed, I have owned this truck since new, I have always changed theoil every 30,000 and run Mobil One oil, the only thing till now that has been replaced under the hood before was: 1 Water Pump 1 Raditator 3 Sets of OEM original plugs 3 Sets of OEM wires 3 Dist caps and rotor 1 starter 3 Throttle Position Sensors That's It!! Transmission was replaced app. 70k ago with a new GM crateunit, system was not just flushed, I replaced all lines, coolers, everything there was. Only other repair was to replace the speed sensor on thetransfer case app. 50k ago. Only other service has been brakes, rotors, etc. This truck has never even been in the dirt. The only towing has been my 19 foot Skeeter Bass boat(reason for the tranny replacement) When this problem raised it's ugly head, it did it in just 2or 3 miles. Now, items that I have replaced trying to correct: NEW GM Complete Dist Unit New Plugs, wires. New OEM bolt on GM Cat. converter New OEM O2 Sensor New right hand exhust manifold (saw a hair line crack whiledoing plugs) New MAP Sensor New Thermostat(just for the heck of it) have had no issuesat all with engine temps at all New Coil New AC Delco Vacuum Valve New Vapor Canister Purge Solenoid All of these items have less than 10 miles on them. 3 differentGM dealerships, 4 other lifelong mechs and a few others along the way. The truck starts like it did the first day, just tap theswitch and she roars to life in a instant, no missing on any cyls, no backfire,no sputtering, baby smooth idle always, oil pressure hangs around 50-60 psi atall times, lowest you might see is 45. Water temp just were it should be rathersolid on 210. You can start it upand take off, also engine hot or cold has no bearing at all. If you pull out on the hwy and apply the gas VERY lightlyand allow the truck to build up its speed very slow you can go down theinterstate with curise on at 80-90 and never know there is a problem. Now, if you go WOTwhen you are running 55, in O/D, tach at app 1500 rpm, the tach jumps up to3400-3500 RPM in a instant, like a rocket, no missing, sputtering nothing atall, but the truck speedo stays on 55 and you go no faster, you can stay at WOTfor 5 10 seconds and the tach stays wound out, but no go. Same action if you gofrom a dead stop taking off and go WOT, tach goes to above and speed may be20-30MPH and no increase. Back of the pedal and let her get up to speed slowlyand it will twist the spedo till the limiter cuts her off. I had her on thelast mile or so the the above 10 and she hit 100 and running as smooth as ababys bottom. The tranny neverslips, whines, nothing at all to notice. I also change my tranny fluid andfilter every 50,000 like clock work. Also pulled the TBI unit off of my 1995 Suburban, TBI has same numbers stamped on it has my truck, exact same running gear, 90k on it, no change in my truck at all, Put the TBI off my truck on the Suburban and it ran justlike it did with its TBI installed, so no problem there..Dang...glad I don'tdrink, but a trip to the American Boys Colledge may be in order soon. Thanks in advance forany and all help. Beaten, Dale
SOURCE: 95 GMC Jimmy 4.3l W vin rough idle
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
SOURCE: 87 chevy truck with TBI idles too fast
Spray the intake with carb cleaner to find the vacuum leak. Check where the EGR mounts and the throttle body gasket sense you had both off.
SOURCE: Shakes while idling and sometimes stalls.
check for minor vacuum leak and map sensor,pcv,egr valve
SOURCE: k2500 chevy 3/4 ton pick up. no power under load
IN your distributer under the rotor is a magnet and a pickup coil (the magnet is known as a pole piece) check your pickup coil for corrsion (green in color) and the module and also check pole piece for cracks in the magnet where the rivets hold it together. sometimes oil wicks up around the distributer shaft because of housing wear or the pieces just wear out over time.
SOURCE: 1995 chevy silverado 350 TBI V8 standard powerloss
have you checked the filter, i know you state the fuel lines are clear though. likely fuel injectors have lost flow. the TBI injectors can be cleaned, but i usually just replace them. but check them using a timing light hooked to the coil wire for timing of each injector spray. the pattern under the light should be even and conical shape, no major spatter. if one shows low volume, the other one should be replaced at same time, it will save you having to change it when you put brand new next to old one a have same problem again. only replace with brand new, i've had 7 bad remanufactured injectors on one truck at one point in time, only replace with new!
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