New to me Spirit R/T, electrical prob diagnose. diagrams anyone?

[zeeboid]

Quote:

Originally Posted by zeeboid also, when boost starts to kick in harder, its choking or missing or something... above 3ish. and when revving with no load, the tach goes all crazytime when you get upto 5500ish.

The linkage problem is now fixed, next are headlights, radio, and drivability.

I guess next I'll work on why it is not running like it should, and worry about the headlights after that is fixed. as described above, when you lay on the throttle, and when boost builds, it seams to choke or miss or something. I am not getting any CEL lights, but I don't know that I would with it not being OBD2. I don't have a boost gauge on the car, but I'm sure that would help to know what PSI that is occuring at eh? I'm pretty sure its occuring at the sameish PSI. Any vacume lines or odd things that when not plugged in can cause it to miss or choke or whatever while under boost?

Also, I've noticed the intercooler can get hot to the touch. I wouldn't think this would be normal...

[iTurbo]

I'd say it's pretty normal for the TIII intercooler to heat soak after repeated runs or even after a 1/4 mile pass. With your miss, what spark plugs did you use and what gap? Might try .028-.030" and see if it still does it. Another thing to consider is using small zip ties to secure the vacuum lines from blowing off under boost, particularly the MAP and FPR hoses.

[zeeboid]

I set the plug gap from 34ish to 28, and till same deal. they are autolite plugs. they looked good so I didn't change em, but thattl probably be my next step. o have some new NGKs to go in.

[charger R/T]

run it with a fuel pressure gauge on it and see what the fuel pressure is when it does it.
Tim

[zeeboid]

crap. I don't have a tool for that. any sugguestions for an inexpensive way to check that out? I don't suppose soemthing like this would do eh?

eBay Motors: TINTED 7 COLOR ELECTRIC FUEL PRESSURE GAUGE & SENDER (item 260226586450 end time Apr-09-08 16:05:36 PDT)

I know you can screw a pressure gauge onto the fuel rail, but you can't read it while driving. brand new w255 fuel pump.

[speeduphoria]

Quote:

Originally Posted by zeeboid I know you can screw a pressure gauge onto the fuel rail, but you can't read it while driving.

You can tape it to the windshield so you can see it while driving.

something like this taped to the windshield is good(they should sell them at local parts stores)

Sunpro Fuel Pressure Tester - Model CP7818 at Sears.com

On the miss, what PSI does it get to?

[zeeboid]

Quote:

Originally Posted by speeduphoria You can tape it to the windshield so you can see it while driving. something like this taped to the windshield is good(they should sell them at local parts stores) Sunpro Fuel Pressure Tester - Model CP7818 at Sears.com On the miss, what PSI does it get to?

ah yes, this I don't know either. I need to order a boost gauge too.

[zeeboid]

Hey all. I don't have a boost gauge yet, but I picked up a Fuel Pressure Tester, and at Idle, it reads a constant 52. I have not driven it with the gauge yet, as the hoze that comes with it is not long enough. I will pick up a longer hose tomorrow and a boost gauge.

[zeeboid]

Okay, I hooked up a boost gauge and a fuel pressure gauge.

Hooked up the boost gauge to measure off of the vacume line here:



This SEAMS to work allright, though the needle shakes a little bit... seams to read 14vac while idling, and the issue I'm having happens at about 15psi boost.

The FUEL PRESSURE when this issue is hapening hits at about 78psi.

both those numbers (boost and pressure) seam high to me, is that right? Remember, I purchased this car like this, I have no idea if anything has been done to it, though it appears very stock. bad fuel pressure regulator?

[speeduphoria]

Quote:

Originally Posted by zeeboid and the issue I'm having happens at about 15psi boost.

Thats exactly what I thought, your hitting overboost, you need to re check all the vac lines be b/c you likely have a leak which would also explain the 14 vac at idle

[zeeboid]

wouldn't it idle high too though? any tips on where to start looking? Everything seams to be hooked up right, but obviously this is not the case

[speeduphoria]

Quote:

Originally Posted by zeeboid wouldn't it idle high too though? any tips on where to start looking? Everything seams to be hooked up right, but obviously this is not the case

well it should cause a high idle, but the car has an AIS so the computer can likely compensate? Or it could be a boost only line from the WGA. But 14vac isn'r right at idle either so cam timing could be off.(I'm not up on TIII's like others so they will know more)

Well you going to want to look for the vac line on the turbo's WGA(wastegate acuator) because thats the line that would be bad, I dont know exactly how the vac lines are routed, I'm sure theres a post with pics and info? If it has a MBC on it then its set to high

[zeeboid]

What is normal idle for these things? It idles at about 1k the way it is.

I spent about 1.75 hours on it tonight, no luck, but then I didn't go back to the WGA, as I need to find a way to get to it through all the stock stuff in the way, unless I'm just not seeing it.

Whats a MBC? Manual boost control?

[speeduphoria]

Quote:

Originally Posted by zeeboid Whats a MBC? Manual boost control?

yes, or Grainger valves are the homemade version that many use

If you built a boost leak tester that would help find a prob with leaks

you know what the WGA looks like right? Its the round canister thing thats mounted on the turbo, it has a round arm that opens and closes the wastegate that is on/in the swingvalve.

I think that this could also be your issue after thinking about it, some WGA arms are adjustable(again I'm not sure about the TIII's). If you have the stock airbox on the car you prob need to take that off to get a better look at things as its right on top of the turbo.

[charger R/T]

if its a stock turbo it can be seen (wga) from the drivers side if you move or remove some of the hoses. if you take off the air cleaner housing you can get a good look at the turbo from the passenger side. yes the arm is adjustable on a TIII.
Tim