i finally gave up!!!!

[martygar8]

well i finally gave up and parked the syclone, and pissed me off so bad, that im thinking of selling the syclone, 89,000 miles and have been trying to fix that miss, that i had and can't figure it out took it to 3 mechanics, and nobody can tell me nothing, change this and that, this is what i have done so far, changed plugs,wires,cap,rotor,o2 sensor,map sensor,vacuum lines,upper intake gasket, clean egr, but still running like crap, and did a smoke test, and no vaccum leaks, but datamaster says map low, im thinking the lower intake might be leaking, what do you guys think:tdown:

 

[WyoSyclone]

Re: i finally gave up!!!!

Yup, if all of those items changed I would guess lower intake gasket... wouldn't hurt to do a compression check.

 

[Don W.]

Re: i finally gave up!!!!

Compression test? Yup. Assuming that's good check that lower intake. It's not as hard as it looks. If yur payin' someone just make sure they have some chevy experience so it doesn't leak at the ends of the block and they know how to re-time it correctly.

 

[Tooky]

Re: i finally gave up!!!!

Send me your DataMaster file. I thought you sent me one before but I looked and I don't have anything? My email is on my website contact.

 

[the baPhoon]

Re: i finally gave up!!!!

Leaky end of block... OK.. RTV? Off topic but ive got my upper and lower off ATM and i wanna make sure i get everything perfectly thrown back together.

My Ty maintanance book says to use RTV on the front/rear lip of the black between lower intake gaskets. Is that the correct trick or is there an added trick?

 

[Trapper]

Re: i finally gave up!!!!

Have you tried pressurizing the intake with a small hand pump to check for leaks?

 

[martygar8]

Re: i finally gave up!!!!

thanks guys, will do a compression check and then go from there, and check that lower intake for leaks, i get a chance tooky will send you that file, thanks again

 

[Don W.]

Re: i finally gave up!!!!

Black RTV on the lower intake / block.

I tried the pressure trick on my truck. Could hear some noise but could not find it. Since I had never done the check before I figured I was being faked out. Long story short it was leaking into the valley.

I've come to believe that the only sure way is to pull the manifold and look.

See here:

http://www.syty.net/forums/showthread.php?t=50844&highlight=intake+leak

 

[The Devils Own Chariot]

Re: i finally gave up!!!!

You wont get crap for it until its running good. I have felt the same way. If you're not strapped for money just park it until the frustration goes away. Then come back later when you feel like working on it. Thats what I do. Anything can be fixed. Just remember that.

 

[NecroWolf]

Re: i finally gave up!!!!

valve lash off? partially stuck/leaky injector?

 

[bezerk]

Re: i finally gave up!!!!

set it on fire...that will learn him!

 

[H-TOWN-TYPHOON]

Re: i finally gave up!!!!

Soooo are you selling?

 

[George Blake]

Re: i finally gave up!!!!

MAP low.
Like VOLTAGE low?
Follow the wire harness back beginning at the MAP solenoid.
If you look close you will most likely find where it was TIGHTLY pulled around a steel bracket. Pull the wiring up and bend it in the opposite direction. It will be a VERY slight cut but that's all it needs to ground it out. This cuts into the harness and will ground the voltage and give a "low" reading. The ecm will try to use the TPS and a fixed voltage for MAP when this happens and the result is a crappy running truck. Let me know if that helps. I've passed this onto 7 different folks over the years and it was the SAME thing every time.

 

[turbodig]

Re: i finally gave up!!!!

MAP low.
Like VOLTAGE low?
Follow the wire harness back beginning at the MAP solenoid.
If you look close you will most likely find where it was TIGHTLY pulled around a steel bracket. Pull the wiring up and bend it in the opposite direction. It will be a VERY slight cut but that's all it needs to ground it out. This cuts into the harness and will ground the voltage and give a "low" reading. The ecm will try to use the TPS and a fixed voltage for MAP when this happens and the result is a crappy running truck. Let me know if that helps. I've passed this onto 7 different folks over the years and it was the SAME thing every time.

I've seen a lot of problems with that section of the harness as well.

This is pretty easy to bug out... key on, voltmeter at the back of the MAP, reading between center pin and the ground pin (A).

Do the same thing on the ECM side... voltage between pin F15 and B6.

If the 2 voltages don't match, there's a wiring or connector problem. If the voltage on both sides is 0, I'd suspect a bad MAP or MAP connector. (Possible bad ECM)

If there is voltage, and it's non-zero, report it here.

Another thing that can cause this- 2 bar chip, 3 bar sensor.

 

[cloneman315]

Re: i finally gave up!!!!

also make sure you have good wires Magnacore or taylor nothing else!!!Also make sure the distributor isnt shorting out inside were that brass ring is.