BuffDaddy915

Just got my car back after trouble shooting loss of spark to all coils. I replaced everything for the ignition system, and ended up being the ECU. So..fast forward to today.

IDLE:

The rpms bounce around 1300-800. Take her for a drive, the car wont hold a steady idle except for the initial warm up (not for long though) then it'll bounce around. I noticed when the idle bounces the airpump moo's..stops..idle drops..airpump moo's...and so on (Side Note: Airpumps hose has only one of those Autozone breather filters on it for now till I can get the Greddy Kit(Previous Onwer setup)). Now when sitting, the car now is shaking ever so slightly. I put the stick in gear and the rpms drop alilttle bit, but its still bouncy.

Heres the weird part. When I turned my AC on, the idle was steady for alittle bit then got bouncy, but it wasn't as bad with the AC off. A storm swiftly came and clouds hid the sun so I turn my headlights on and WOLA! Rock solid idle at 1200 rpms without the slightest bump on the rpm needle. When I put the car in gear it drops to 1100 rpm and away I go.

Another thing, at idle it sounds like mini not very load backfires (almost like puffs). Searched, and found something called afterburn. Now I get afterburn all the time while idle, and decelarating with the car in gear. Is this normal?

Boost:

I get 5-7 psi on primary, and the same on the secondary....which kicks in roughly 6000rpms now. The Boost gauge needle will flutter (Wastegate not ported) around 5 psi, this varies with which gear Im in. I also hear the fluttering. I hear a lot going on when trying to boost that I didn't before. Im hearing what I think sounds like muffeled air..which leads me to believe theres a leak somewhere. Would a leak cause these symptoms?

I've tried to understand how the Turbo System works, could someone point me to a thread that breaks it down fully and into less complicated terms? I've tried to understand it, but most threads start off and continue with only this solenoid, or that solenoid.

Noise:

After I installed 2 new CAS, I noticed this clicking/chattering noise coming from the engine. I installed the CAS right, they're as far back as the last pair, and I even pulled everything apart after I heard it the first time I installed it and looked at the sensors and there didn't appear to be any rubbing.

Lastly:

I noticed my oil pressure sender unit on the drivers side (I think it is, has 1 wire with a white clip that plug into the block on the bottom?? was dangling..exactly how bad is that? Should I not be driving the car like this or does that just tell me how much pressure of oil I have and thats it?

Thanks for all the help before, and in the future!

dgeesaman

iTrader: (7)

the putting and puffing at idle is normal. On deceleration I never get it, but I'm not sure if that's the same thing.

the secondary does not kick in at 6000rpm, only at 4500. In some cases, it will engage lower. If you aren't feeling boost until 6000, it's because the boost is not being produced, not because it 'waited'. You probably have a boost leak, major fuel problem, or clogging exhaust component. What was your boost in the past?

Dave

TpCpLaYa

iTrader: (10)

damn man that IS alot of problems. Well first off i would definately check your TPS as far as your idle issues. Make sure its within spec. The wire to the sender is just for that and wont affect pressure. The airpump moo thing can be cleared up with the restrictors in the hose. Also theres a white plumger thing attached to the UIM, think its the ICS(?)...it could use a cleaning probably if it has never been before

BuffDaddy915

Boost before the spark issue was 10-8-10..it would flutter on the 2ndary in 2, and spike in all gears, but 3rd and I believe 4th (Haven't really takin in WOT that fast) were normal as far as fluttering.

BuffDaddy915

Well..fooling around under the hood I found some stuff:

1. A bolt to the elbow was very loose..would this cause any of these symptoms?

2. Theres this 1 wire that connects to a white connector..which looks like it supposed to have 2 wires to it. Its dangling..and the other side of the wire goes to the bottom of the back portion of the motor under the spark plug areas. What is it? (Trying to upload pics)

BuffDaddy915

Pic:

impactwrench

I believe that goes to the Knock sensor

poss

iTrader: (5)

That's the oil level sensor and it's only supposed to have one wire.

F0RSAKEN

Yeah, that looks like oil level. Knock sensor wire is further forward on the engine, and black. Well, mine is.

BuffDaddy915

Oh god..I seen knock sensor and almost crapped myself lol. Ok..cool.

So anyone got any word on the other things thats goin on?

RaPtOr-T

Like said before check the TPS, a incorrectly adjusted idle bleed screw can cause RPMs to bounce but it dosent really sound like the culprit here. As far as the small backfires...does it sort of sound like the noise a piston engine makes when a cylinder misses? My car will do that commonly when its warming up around ~1300rpms, but that goes away when it falls down to normal idle. If the elbow was lose enough to leak air then yes that would cause problems. Before checking more complicated things on the turbo system check for basic leaks, have somebody sit in the car and rev it 5k or so rpms a couple times while you look/listen for leaks over the engine bay, pay attention to the y-pipe coupler and all the piping between that and your elbow, perhaps you have a leak thats causing the primary to not produce enough boost when it should which could case the secondary to come on much later. The oil pressure sender should cause a problem, mines never worked and I dont have an immediate plans on replacing it. Im not sure about the noise and its a dumb question to ask but you have the A/C off right? My compresser makes some goofy clicking noises while its on. Not sure if any of that helps, but I've learned with my car to always check the basics first.

BuffDaddy915

Ok, I guess Im gonna hafta learn to master adjusting the TPS sometime right : )? Well my small backfires occur during driving of any kinda as long as my foot is off the gas. I have however noticed actual backfires but they were a tad louder then the little backfires sooo my guess is...theyre all backfires.

With the turbos I'll deff. do that tommorrow. I feel much better about the oil pressure sender, and the AC is always off cuz it only blows hot air.

Ottoman

if ur airpump is removed.. it will also cause a surging idle

ilostmypistons

If you need a hand with the TPS pm me. Ive done it a couple times and Im just a few miles away by Chappel Hill Golf Course in McHenry. Ive been through the same problems.

BuffDaddy915

So I've deff. come to realize that idle, and boost issues are common witht these huh?

dgeesaman

iTrader: (7)

About the only thing we don't have is valve trouble.

BuffDaddy915

Lol..surprisingly