When trying to start my 383 I need to hit the gas on a cold start and after words it idles rough and sounds like its missing. After the car warms up, but before close loop operation the car starts running better. Many times even when the car is warm it needs a couple taps on the gas to get it going. And for the next 30 sec after its running the car will hesitate when the gas is hit, not very bad but you can tell. I have no idea what the problem is. I plugged in a scanner and I got no codes, many of the sensors that I could check with the scanner seemed to be fine. I have 5frames of info from the scanner I will post. These frames were when the engine was sputtering and at operating temp. Also all plugs are in the correct spot and I cant seem to find any vacuum leaks and I have a new fuel pump. Shoebox HELP!!!

Thanks for what ever help you can give

Fuel sys 1 OL
Fuel sys 2 OL
Calc load % 0 0 3.5 6.6 4.7
ECT (F) 206 206 206 208 210
STFT B1 % 0 0 0 0 -1.5
LTFT B1 % 0 0 0 0 .7
STFT B2 % 0 0 0 0 .7
LTFT B2 % 0 0 5.4 8.5 9.3
MAP (INHG) 25.1 21.8 20.3 12.6 17.7
ENG RPM 0 1377 970 1475 888
SPARK ADV 0 28 31 39 17
IAT (F) 141 141 140 138 136
MAF (LB/MIN) 0 1.291 2.261 1.978 1.301
TPS % 0 0 5 1.9 0
02S B1 S1 V .03 .8 .375 .760 .275
STFT B1 S1 % 0 0 0 0 -1.5
02S B1 S2 V .85 .905 .840 .865 .9
02S B2 S1 V .04 .2 .725 .870 .535
STFT B2 S1 % 0 0 0 0 .7
02S B2 S2 V .87 .915 .88 .9 .885

 

have you checked to make sure you didn't cross any spark plug wires? also age of the opti? and age of the plugs? also since you just built a 383 how old is the gas in the tank?

 

plugs are new, wires are correct, the gas is a couple months old but its mixed with new gas. the opti is original. never had problems with it b4 the rebuild

 

it could have very well died. have you got access to a oscilscope or a dyno to check your ignition? or you could just do the tests listed on shoebox's site.

 

I do not, ill probobly do the tests in the book. I havent read into it yet though. What is that site?

 

http://shbox.com/1/4th_gen_tech1.html

 

when the car is cold turn the key on and scan to see what the ect sensor is reading, then watch it as it warms up to see if anything funny is happening

 

i dont have the scanner any more. But it looked good from when i checked the numbers. It started at 94 deg and moved up to 210 ish

 

don't feel bad . i have a second attempt at a dyno set up tomorrow. well today the car started to run like it had a bad plug. bought a new set, pulled the old ones out and found numbers 6,8 and 5 were slightly fouled. to me it looked and drove like the wires were going bad. installed new plugs and the car runs worse. guess the wires are bad and after pulling them off this last time they decided to go to the big junk yard in the sky. now i gotta leave at 7am, get to the shop by 8:45 and buy a new set of wires and install them before i get on the dyno. now isn't this hobby just great. i hope you feel a little better just knowing that we all have issues, none of these cars are perfect. good luck DSM

 

lol I know put all the money into these cars and they still dont work wtf. Just like a woman... But thanks for your help Ill check out the dist as soon as i can. I rant into another problem where i tried grinding off the weight off the fly wheel. DONT ANY ONE DO THAT. the heat from the grinder helped bend the fly wheel so now i cant start the damn thing till i replace that.

 

lmao i popped a et street on the dyno today. oh well time to take a break and wait about 3 weeks and get the passion back.

 

popped a wut? I feel you though some times thats what you got to do. site back and wait for every one to **** you off enough for you to get the car back on the road. either that or watch some bad racing movies lol

 

I have not checked the opti yet but will do that today. I also want to check the MAF. I just got rid of the vibration in the car by grinding off the weights (dident bend the flexplate luckly) so after car start the car will bog down if i hit the throttle hard, if i hit it light it will accel lightly. I think its running rich. I can smell the gas during the time im having these bogging issues. after a while of running the car it will accelerate fine. Also I do not feel the power that i was expecting from a 383. Is it me or what? If you guys have any other ideas please let me know. I will try to test the opti today if I can.

Also when I looked at the numbers posted above i notices that i got 2.261 lb/min (17.093 gps) from the MAF when i was at 970 rpms That is very high for idle. It is strange that this reading is way off but the others are fine?

 

a et street drag tire.

 

this may sounds stupid but how do you even get the leads of the multimeater on the leads on the sensore? that guy is so far down in there.

Also i took the car for a drive and it drove fin. it had a problem only on one start up when warm i needed to hit the gas to get it running. also i started the car in the cold today. (bout 50 deg) and it started right up and it dident sound like it was running fine but it was running really rich. I could smell the gas.