bucking and jumping around low rpm
07-11-2016, 09:47 AM
#1
Thread Starter
Join Date: Jul 2016
Location: kentucky
Posts: 16
bucking and jumping around low rpm
Hey new to fourm. I have a 1990 5.0 with a v1 supercharger, trickflow stage 2 cam trick flow street upper and lower intake.autolite 3924 gap .32. Stock distributor with msd cap form racing wire.
Having some major issue with bucking and jumping around after car warms up and then it won't start back up. Running on a good day 10 psi of boost.
Having some major issue with bucking and jumping around after car warms up and then it won't start back up. Running on a good day 10 psi of boost.
07-11-2016, 10:23 AM
#2
6th Gear Member
Join Date: Mar 2010
Location: Wisconsin
Posts: 5,061
Welcome to the forum.
Are any codes stored ? If those are clear, start looking for a vacuum leak. If none are found after a thorough check, clean MAF sensor and try a base idle reset.
When you say it won't start, what's missing ? Spark or fuel ?
Does it start right back up after the motor cools down ?
Are any codes stored ? If those are clear, start looking for a vacuum leak. If none are found after a thorough check, clean MAF sensor and try a base idle reset.
When you say it won't start, what's missing ? Spark or fuel ?
Does it start right back up after the motor cools down ?
07-11-2016, 10:36 AM
#3
Thread Starter
Join Date: Jul 2016
Location: kentucky
Posts: 16
Yes if I let it cool of it will start. The motor with kinda want to start after it dies then the battery dies and have to get pulled. Replaced all vacuum line not long ago. Mass air is clean. But I tried adjusting the fuel pressure and put it to 40 with vaccum line off and it didn't really move whenI put the line back on
07-12-2016, 07:05 AM
#5
6th Gear Member
Join Date: Mar 2010
Location: Wisconsin
Posts: 5,061
Yep, ^^^
Take the TFI module off the distributor and take it in to your local parts store. They will test it and when they do, have them run the test 3 times so it gets nice and hot. This is when they fail if they're bad.
Did these issues your having just start ? Was the car running fine before ?
Take the TFI module off the distributor and take it in to your local parts store. They will test it and when they do, have them run the test 3 times so it gets nice and hot. This is when they fail if they're bad.
Did these issues your having just start ? Was the car running fine before ?
07-12-2016, 09:01 AM
#6
Thread Starter
Join Date: Jul 2016
Location: kentucky
Posts: 16
well when I got the car it had a cracked shorty tube so I put long tubes and a H pipe on it. well then is when some problems started. then I replaced the tfi module and everything was decent. the I put the intake and some suspension stuff on and it all went down hill after that. it just really weird I can drive about a mile with the biggest smile and then boom crash pop. peddle the gas to keep in running and it die. like when it starts back up and I mash the gas it get to like 2300 rpm and then it seems like I have no more throttle cable. but I let out and shift and it will kick back in but still having problems. I will take the tfi off on my lunch break and take it up there and see what they say. thanks ill keep yall updated as much as I can
07-12-2016, 02:29 PM
#7
Thread Starter
Join Date: Jul 2016
Location: kentucky
Posts: 16
well took tfi to parts store showed up bad. replaced it already. the car starts a lot easier now then it did. gonna drive it after work and see if that fixed it. but another question. why would I have to floor it to start it.
07-13-2016, 09:40 AM
#8
5th Gear Member
Join Date: Jul 2012
Location: ohio
Posts: 3,628
TFI module could have fouled your plugs, or your coil. When you floor these cars the ecm shuts the injectors off. It helps it start from having too much fuel or a weak spark.
07-13-2016, 10:05 AM
#9
Thread Starter
Join Date: Jul 2016
Location: kentucky
Posts: 16
AND IT WILL ONLY IDLE NOW WHEN IT COLD. I HAVE A SCREAMING DEMON COIL PACK AT HOME I CAN PUT ON IT. IS THAT A GOOD COIL. AND ON MY SET UP WHAT DO YOU BELIEVE I SHOULD START MY TIMING AT LIKE WITH SPOUT CONNECTOR OUT.