drove the car today and it felt okay at first. then i got on it, and it started hesiting real bad. it kind of feels like its redlining, but the rpms still go up. it would start at about 4600 rpm, but then later it did it at 3k rpm also.

can't really explain how it is, it feels like its bogging real bad. maybe like its missing...i don't really know.

i have an ls motor with a greddy kit.

i checked my plugs and the electrode is white and the little medal deal that on the bottom of the spark plug had white spots. the part about the electrode, where the threads are, was black.

any ideas?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stockhatch &raquo;</TD></TR><TR><TD CLASS="quote">i checked my plugs and the electrode is white and the little medal deal that on the bottom of the spark plug had white spots. the part about the electrode, where the threads are, was black.

any ideas?</TD></TR></TABLE>

Those little white specs are significant signs of detonation. The last thing you want is for your motor to run lean, thats why they are white.

Which plugs are you running and what is the gap set at? I would advise to have the motor tuned soon since you are obviously detonating when under load.

 

i'm using ngk's 2975 spark plugs. they are zfrf7-11...something like that..can't remember the exact number thats on them.

would too much timing be the sign of some detonation?

do you think thats what it is...detonation? when the bad bogging/hesitation happens, i have to let off the gas. i thought detonation what the ticking noise or a sound like rocks in your engine?

my gap is at .030 and i have an msd sci, msd blaster 3 coil, msd plugs wires also with the msd distributor cap.

 

you need to use 1 or 2 step colder spark plugs... i recommend ngk bkr7e

 

the plugs i am using are two step colder plugs. i've always used these plugs with no problems.

here's another thing. i don't have my stock ecu right now so i tried another ecu. its an all motor ls ecu. its chipped for an all motor set up. i'm assuming it advancing the timing under WOT. i've used this ecu on another boosted motor that i tested out and it didn't do this. these are different motors though..maybe this ls motor doesn't like that chipped ls ecu.

 

No ****!!!!! so the sound of rocks inside the engine are signs of detonation:::?? like a clickin sound type.. cuz mine is doing that and I can't figure out what it is. its like I have something loose inside! and i'm using some colder plugs.. dunno which 1s but yeah... and the gap is 43 i think!!

sorry to but in to ur thread man.. i'm getting the same problem.. my car was resetating, like holding back. then when it gets to 4rpm it goes way faster.. like vtec or something kicks in... like something was holding me back and then let go..

by the way i'm running 4psi stock injectors.. timming is pretty good..

is that detonation signs??? could i be leaning out??? oh Soch Vtec in a crx si. let me know what you guys think!!! pls.. heeh..

 

i think you answered your question there.

i personally would never use an all motor tuned ecu on a boosted car.

obviously too much timing is bad.

 

i'm going to change out the ecu and see what happens.
i'm also going to look for any ground wires not connected right.

my timing at the distributor is set back to 13 btc.


could this also relate to the tps sensor? i don't have a check egine light though.

 

detonation is either too much timing lead, or not enough fuel, fix those problems, no more detting.

 

thats what i'm thinking....too much timing when i get on the gas cause of the ecu i'm running with right now. i haven't driven my car since then.

i'm also going to check the black box that came with the greddy kit that goes to the tps sensor. i wonder if that may have something to do with it. when i change the ecu wednesday, if it still does it, i'm going to take off the black box. i know i will get a check engine light when i hit boost, but i just want to check it to see what happens.

any other ideas guys on what to check for? the main thing i think it is is the ecu and its timing curve....but i could be wrong.

thanks

 

i thought detonation had a different feeling/sound when its happening. mine feels like a real bad hesitation.....could this still be detonation?


thanks

 

also wondering....could the box that comes with the greddy kit cause this? i don't have the blue box, but i have a similar one to it.

can i get rid of that and use a missing link with the greddy kit?

 

still can't figure this damn problem out.

i'm getting fuel, i'm getting spark, i took the greddy box off too. it still does it. i even changed spark plugs. my wires are new along with the msd coil that is new also.

one thing i noticed is that when i pull out one of the spark plug wires, you can see a real big spark compared to the other wires when i pull them out. don't know why though.


when the car is at idle, if you rev the rpms up slow.....it will rev up just fine. if you go fast, the car will start to hesitate.
i drove it again today and right when i took off in first gear, it started hesitating real bad. i didn't even floor it, just took off normal. if i get on it, it does it even worse.

my friend thinks it could be the rotary cap inside the distributor cap.

anybody else have any ideas?