chrisfc3s

OK i got one for ya got a 88 na i got hessitation all therough the rve range
new plugs wires fuel filter sock filter air filter tps is in range and the bac is working properly and no the wires arnt on wrong. any clue ?

ok so heres the up date w the hesitation its mainly around 5800 to 7500 range its not the 3800 ive seen x times and read

na5

what engine na or turbo? if na mybe your 5th 6th ports aren't fully opening

fc3s91

iTrader: (23)

Have check to see if you have spark on the trailing side.
Thanks Robert

BASTARD

iTrader: (4)

have you done a compression test?...does it idle smooth? water in the fuel?? bad ground???

chrisfc3s

ok sorry its a n/a compression is at 100 on both housing trailing side is firing just filleed the car up 93 oct w a can of oct booster

Rotary_MD

Check out the secondary injectors - that was my problem with full throttle hesitation.

InsomniacFC

iTrader: (4)

93 octane? That might be your problem.

http://www.ftc.gov/bcp/edu/pubs/cons...tos/aut12.shtm

Try 87 and see if it persists. I might be wrong, but as I was told high octane (91+) was for either high compression, big bore, or turbo cars.

Aaron Cake

iTrader: (1)

First of all, get rid of the octane booster (waste of money) and the high octane fuel (waste of money). Neither one of which should cause hesitation, but both are pointless.

Are your trailing wires on the correct plug?

Is the boost sensor hooked up?

Another thing to check is the wiring around the CAS. Clean the plugs on both sides, check the harness for splits, etc. If the CAS signal is breaking up then the ECU won't know when to fire.

NoDOHC

AFM connections can cause this too, as can MAP connections (from my experience).

misterstyx69

iTrader: (142)

..TEST your Trailing Coil for Spark:Go to your Trailing Coil ..with the Engine Running..USE INSULATED PLIERS...Pull a Plug wire Off the Coil..To see if the Coil is Firing..if it is, it will shoot a Spark from the Coil to the plug wire.Enough to see with the Naked eye.,..Now Pull the Other Wire Off at the Coil..if it Sparks there too,Your Coil is Fine..IF it Does NOT spark from one side or the Other,then your Trailing Coil is BAD....I had a Bad Trailing Coil On one side of the Coil..The car would be fine until you start to Accelerate.Then it would Knock,and "ping" like teh Timing was off..That is what I found,Bad Trailing Coil.Afterwards,it would get up and Go like a scared rabbit!

chrisfc3s

ok i know the coils are all firing fine just went out side and cked all of em i changed the maf w a known good one out of my buddies car he dds... sooo the injectors are next ill do that in the morning fingers crossed this is my prob if not im gonna burn the pain in the @#$

atsronnyats

i have a simillar problem only my car will not idle its a stock 88 N/a only thing different is i havent changed fuel sock nor wires but plugs were installed this week (i have yet to take off the intake manifold to look at that ground for secondaries as well) i havent got a hold of a multimeter to test impedance on any sensors yet working on that..... this idle problem has worsened since it got colder and has always been terrible with heat or a/c turn on at starting

any input on that fellas????????

jamesdean

Aaron cake "Another thing to check is the wiring around the CAS" whats i the CAS again, I know its an apreviation, but I dont know what that is......Im dumb lol...not stupidol...jk

2ndgenrx

CAS= Crank Angle Sensor

The circle thing on the front of the engine. Driver side

Jamest2

check for leak between afm and intake, I am new to the club but have seen this several times before, if there is a leak it will run lean

chrisfc3s

well got an update on the hesitation its fixed... went throught the whole vacume sys and replace all the hoses 8 feet of them. also went and read up on the 3800 hesitation in the archives and regrounded the system and well its alive no hesitation no studder no stumble you guys and gals are the best