I JUST BOUGHT MY FIRST TY 2 WEEKS AGO. SHE WAS RUNNING REALLY RICH WITH FUEL PRESSURE READINGS @ 55PSI. IT WAS HARD TO START AND TO KEEP RUNNING. I FOUND THAT THE TY HAD AN ADJ FUEL PRESSURE REG AND WAS UNABLE TO TURN THE ADJ NUT. SO I PUT THE STOCK REGULATOR BACK ON AND IT STARTS FINE AND SEEMS TO RUN BETTER. MY QUESTION IS THERE IS A SLIGHT MISS I CAN HERE @ IDLE. ALSO I CANT READ MY BOOT LEVELS (BOOST GAUGE ON ORDER) BUT MY BOOST SEEMS REALY INCONSISTANT AND DOSENT PULL VERY HARD. I AM GOING TO ORDER DATAMASTER TO HELP WITH DIAGNOSIS AND TUNING. ALSO THE TRANS SEEMS TO SHIFT EARLY INTO 3RD AND 4TH GEARS. ANY HELP WOULD BE GREATLY APPRETIATED.!!!!!
weird boost levels, slight engine miss
- Thread starter nates92ty
- Start date
I have yet to stick the throttle, since it is running bad so it is hard to say if the trans shifts only durring WOT. it seems to shift early all the time. When i bought the ty 2 weeks ago, the seller said he replaced all the ignition hardware; cap, wires. This is whats got me; yesterday i desided to change the plugs that were in it to the CR42TS which everyone in the fourm says to run and it seemed to make my ty run worse...Also as far as timing goes, i checked it with the tan wire disconnected and saw 14.7 on my MSD light. I loosened the dist. to adj timing and as i moved the dist. it didnt seem like the timing was changing much at all...On the Rad support it says to have you timing @ 0BTC. Any help would be great! thanks
nates92ty said:
well if your new plugs are gapped correctly, you've ruled that out...how many miles on the truck? there are many more reasons that your truck may be bugging out...the old owner may have replace the ignition components, but how many miles ago? some components only last 2000 miles...bad vacuum lines or a bad vacuum line can mess everything up...try to force the truck to accept 0btc to rule that out as well...make sure you're using the correct hashmark on the balancer (paint it with white out) and your on the #1 plug wire...verify top dead center by using a piston stop to rule out that the balancer didn't slip on you...you could also reset the ecm by pulling the right fuse or disconnecting the battery for a minute before you restart it...timing changes don't always immediately make the truck run better, or at least not for me...reset the computer and let it idle for a minute to see if it flattens out...my truck died when i set it to 0btc after waking it up from the dead on a new motor...we had to manually keep it running (using the throttle linkage) for the new timing adjustments...after a few minutes it seemed to learn itself and straightened right out...theres are lists all over this board that can serve as checklists to help you fix your problem...as for the shifts, your tv cable for the tranny may be out of adjustment...if you take it upon yourself to adjust it, be very careful as i understand you can smoke your tranny if its way off...maybe a reputable tranny shop could help you on that one...but i wouldn't jump into that until you iron out the engine miss...believe me, i understand these trucks suck to work on under the hood, but if you can squeeze a thirteen out of it, you'll be smiling, guaranteed...
I have similiar problems. Also my SY changed altitudes from Detroit to 4500-5000 here in WY, any thoughts? Thanks
MRKING
New Parts for Old Trucks
thanks for the advice 93ty475..I will be replacing the vacume lines as soon as i get a chance. Are there any diagrams for the roughting and placement of all of the vacuime lines? Also is the only way to check TDC exactly is by using a piston stop? I dont want to take the head off....but i do want to make sure the balancer is dead on. thanks
nates92ty said:
your welcome...the above mentioned website as well as www.syty.huryde.com have helped me tremendously with vacuum lines and such....having internet access is a major plus, so you're already ahead...there are many more...these people don't recieve the credit they deserve...as far as the piston stop, i've never personally used one, much less seen one...i have someone click the starter until #1 piston (front driver's side) puffs out air with your finger over it...then i go to the balancer and line it up...make sure you have the correct hashmark id'd...i think you could be 180 off, but you can figure it out...you could also carefully put a skinny screwdriver in the plug hole and have someone turn the crank back and forth, manually...no clicking the starter when doing that...my sy has a fluid damper balancer so i don't think it should slip...a weak timing chain could also make timing fluctuate while using a timing light...as long as your willing to work on them, syty's will run...peace :drinking:
SeattleSy#1255
Category 5 Conservative
all this was stated before in your last post...