You can get the denso rebuild kits (o rings, filter, and the plastic cap) for the injectors about anywhere. I used Bosch injector clips. THey did not fit directly on cause the tit is centered on the clip, and off centered on my ijectors. I just shaved the tit off the injectors. They add not extra clamping. I also used shrink wrap to seal the rear of the Bosch clips. You will see what I mean. Instead of electrical tape, the cheap stuff, I used the more expensive silicone wrap for the wires. Soldier everything you can. ANyhow, hope that helps.

 

i bought HKS clips that i have yet to install....

yay for $15 a piece....

 

Anyone get a lean spot before secondarys come on?

 

That would probably be because they're supposed to come on and don't.

 

I thought it to be pretty common to have a lean spot there. Yes, I have that lean but only when feathering it up around 3400-3600 rpm. If I romp on it, you do not feel it.

 

Well, I guess it depends on what he means by lean. I was assuming he meant very lean.

 

LOLOLOL... good point!

 

I kno A/F gauges aren't very accurate but it went down to the 1st red bar

 

ahh, my car has the slightest hesitation still, if i pin it i dont notice it, but if i drove somewhat nicely there's a little blip at 4200rpm and only at 4200rpm on the nose, any idea's guys?...

it seams like your slight problem, think they are related?...

 

well, on the t2 S4 thje secondaries come on around 3450 or so. That is where my problem is.

What did you do to get rid of the hesitation?

 

ground the coolant filler neck got rid of a fair bit of the hesitation, then since the shop i had install my intercooler moved the o-ring from the rear-rotor housing to the front, i had previously ground it but figured for the hell of it i'll find a bolt to put in the rear-rotor housing, ground that to the bell housing, then the bell housing to the firewall....

i cleaned up some of the connections for the grounds under the trailing coils and the one on the firewall, they were clean but it was for good measure....

i took the car out, drove it around a few blocks, bit my tongue and pinned it and screamed "******* RIGHTS" when it ran properly....

i get a slight hesitation when i'm light on the throttle or even 1/2 on it at exactly 4200rpm, it's weird....

but if i romp on it, it's not there, i just feel the secondaries come on ( i believe ) and the car is gone....

when your cruzing and you pin it, do you feel a little blip?, i was told this is the secondaries comming on, is this true?...

i have 720cc's for secondaries....

 

I do get a little blip when the secondaries come on. But not at that rpm. What aftermarket cpu are you using to control the 720's?

 

an FCON with GCC....

it was rough tuned, and only tuned for higher end....

at light throttle or medium throttle, i'll get a hesitation when the secondaries are supposed to come on ( 3600rpm approx ) and at 4200rpm, but at WOT they are none existent, i only feel the secondaries come on, thats it....

 

If you have mismatched primary and secondaries you'll always get a hesitation when the secondaries come on, even with a fuel controller. It's caused by the change in AFR at that point. Even a well-tuned fuel controller isn't sophisticated enough to get a smooth transition. If you have stock injectors or matching upgraded injectors you should feel nothing at the transition.

 

so a somewhat hard-hit when the injectors come on is somewhat to be expected?...

 

If it's probably tuned (which yours isn't) it shouldn't be that bad.

 

yeah, i'm sure with a good tune it wont be that bad....

it feels harsh when the injectors kick on, but thats the only time it hesitates....

and a slight one once in a while at 4200rpm for some stupid reason....

 

i'd like to also note, you can feel the hesitation revving in neutral, aswell as driving through the power band no matter how hard on the throttle you are....

any idea's?...

 

You can think of grounds as two different types. One type is used to complete the current loop from positive to negative and the other is used as a reference for circuits that measure voltage.

The ground wires from the battery to the body and engine are meant to carry large amounts of current. The Emission Ground (page 50:10 & 50:16 in the 86 manual) is used as the reference for the 5 volt sensor circuit (and also for the ground shield wire on the oxygen sensor although I've never actually seen that shield) and it would fry the ECU if any large amount of current ever tried to go through that ground.

It's interesting to see that the harness ground on the top of the engine brings the engine ground reference to the ECU and the ground in the boost sensor is the ground reference coming out of the ECU going to all the sensors.

By the way, the harness ground on the top of the engine also is directly connected to the fuel pump jumper (not the check connector like I said earlier)

A good solid ground on the 5 volt sensor system and oxygen sensor will guarantee that the ECU knows exactly what is going on in your engine.

Frankly I don't understand how those grounds could cause the 3800 RPM hesitation, but it couldn't hurt...

ed

 

Speaking of grounds, when I took out my tranny, I didnt know there was an extra small ground on top of it, and now I dont know where the plug on the end of the wire is supposed to go. Where does it go?

 

bellhousing to firewall....

 

That shouldn't be happening since the secondary injectors never come online in neutral. EVER.

UNLESS, the boost/pressure sensor has its vacuum line disconnected or there is no source of vacuum to that line. Or the boost/pressure sensor is kaput internally.

THAT hesitation is not seconday injector related if the boost/pressure sensor is working right.

 

yeah i figured as much, i dont know what the problem with that is....

i'm still wondering if the UIM ground differs from the ground on the rotor housing....

if it does differ, does anyone have information about it and/or pics?...

if it does, i'll be heading to the garage to fix it asap....

 

Did i get the UIM Ground done properly?, and in the right place?...

I couldnt reach it unless i took the throttle body and UIM out, so i'm assuming yes....

And there was nothing else i could have grounded that had a clip on it, this one did have a ring connector, and this was the best pic i took....

Any Input?...

 

* EDIT *

I just took the car for a drive, it still hesitates at 4200rpm, but if i go WOT and start racing through gears it wont hesitate....

i dont get it....