Pressure wash? Take it to a car wash and that should supply enough pressure without tearing it up.
Drop idle via the "baseline idle reset procedure" should be easy fix.
As for high nox, could be a few things. Verify the egr function. Set baseline timing to 10 degrees. Could also be bad/aged o2 sensors. Might be worth a pair of new motorcraft sensors.
The verdict is in....the Mustang did NOT pass emissions.
Told the idle was borderline high, just under 1,000 RPM. And, the NOx levels were too high.
Below are the readings for the different test points:
At 15 mph, it measured 1348 RPM. Emission levels were
--HC (PPM) : Actual 40 (max allowed 85)
--CO (%) : Actual 0.01 (max allowed 0.54)
--NO (PPM) : Actual 838 (max allowed 629)
At 25 mph, it measured 1158 RPM. Emission levels were
--HC (PPM) : Actual 30 (max allowed 67)
--CO (%) : Actual 0.01 (max allowed 0.45)
--NO (PPM) : Actual 785 (max allowed 686)
So, it looks like it failed because NOx were too high and the idle rpm were accelerated.
The technician suggested I look into vacuum leaks to lower the idle RPM, or possibly retarding the timing.
Looks like we have bit more reading to do to figure out the issue here.
Jhp & son (slightly disappointed)
You guys are brilliant and your advice stellar. My son and I followed the recommendations and got results.Drop idle via the "baseline idle reset procedure" should be easy fix.
As for high nox, could be a few things. Verify the egr function. Set baseline timing to 10 degrees. Could also be bad/aged o2 sensors. Might be worth a pair of new motorcraft sensors.
..
I will try to post a picture of the project car shortly. Need to track down the passenger window switch so we can open the windows. It gets hot inside with the windows up.
I will try to post a picture of the project car shortly. Need to track down the passenger window switch so we can open the windows. It gets hot inside with the windows up.
Well, we tracked the problem to the power window motor. The brushes have fallen off the copper wires. I have searched far and wide for replacement brushes. Only ones I can find are attached to the copper wire on the bottom. However, the ones on the motor were attached on the side. The spring was underneath the brush, and the copper wire was connected perpendicular to the travel of the brush.Motorcraft sw7062 is the part number for a window switch.
Don't bother with the aftermarkets...they suck.
Really? By the time we were nearing the end of the tests, there was an awful lot of smoke in the garage. A smokey haze. Why would that be? It wasn’t noticeable at the beginning. By the end, we could see smoke in the engine bay.Check fuel. Misfire and o2 codes could be the result of fuel starvation
Well, my son came home about two weeks ago, barely rolling into the driveway. Said the car had died on him on the road. Restarted it and inched his way closer to home. Finally made it up the hill and rolled into the driveway, with the engine off.
I asked if he had run out of gas. He said, "No, my friend and I put gas in the morning."
Checked it out and it wouldn't start. As I was already dealing with a timing belt and water pump issue on my 99 4Runner. I told him we could get to it later in the week. After several unsuccessful attempts (using the Crank No Start thread) over the course of ten days, I snuck off and grabbed two gallons of gas, poured it into the tank, and voila the car started.
Now, after a few choice words mutter under my breath, I turned to him and said, "It doesn't sound right, seems to be idling high and stuttering." It smelled odd, not sweet just rich and burnt. So we started looking for vacuum leaks with our homemade baby oil/soldering gun smoke machine. No luck.
Looked in the forum for guidance and came across a thread that recommended using an OBD-1 code reader to try various tests (KOEO, KOER, and CBT). Here are the results:
KOEO: 11, 10
KOER: 41, 91
Cylinder Balance Test
Test 1: 70,
Test 2: 70,
Test 3: 60, 70
Don't have a compression tester and the ones at the local auto part store are already rented out. So unable to check on that tonight (we may end up buying one, so if you have any suggestions, please let us know. I'm trying to get my son a decent set of tools as we go along with the project car).
Looking at the test, I am assuming that there must be a leak, since we replaced the O2 sensors recently (when the car was emitting too much NOx). Need to work on putting together a better smoke test machine. Also, little confused why cylinder 6 only came on after the third test in the Cylinder Balance Test sequence. Shouldn't it have popped earlier?
Should we switch ignition wires and spark plugs on these two cylinders to two other cylinders and run the CBT again?
What are we missing? Could running the tank dry (we installed a brand new tank, fuel pump, and sending unit [which for some reason hasn't worked from day one so the car doesn't register any fuel even when we fill it to the hilt]) have caused a problem with the injectors (seem to be the original ones).
By the way, we made the mistake of running the tests in the garage, with the front of the car facing out. Good thing we have a side window and side door. We nearly succumbed to the exhaust fumes. We are working in the garage to avoid the heat. Will have to rethink that, I think.
Anyway, thanks for any advice and guidance. Nearly strangled my son for the empty tank, but giving him a pass because he did say upfront that the car was idling poorly and backfiring beforegand.
Thanks, jhp and son.
Really? By the time we were nearing the end of the tests, there was an awful lot of smoke in the garage. A smokey haze. Why would that be? It wasn’t noticeable at the beginning. By the end, we could see smoke in the engine bay.
I get the point of the O2 sensors. Maybe need to check for vacuum leaks again.
On the fuel issue, should we check fuel pressure on the rail? Or are we checking the injectors?
Why would cylinder 7 and then cylinder 6 pop up in the CBT?
A lot of questions, we know. But, on the bright side, we keep learning.
Jhp & son
Nope,My son was rear ended this week while driving on the freeway. The other driver was 79 years old and had a Toyota 4Runner with an off road body package (heavy front grille).
Fortunately, it was during rush hour traffic in Los Angeles. So, traffic wasn’t going very fast. Nonetheless, his bumper sustained some damage. We need to replace it.
Saw an used rear bumper from a 1995 SN95. Can we put this on the 91 GT?
Thx, jhp84 & son
He is fine. A bit shaken up, that’s all.Nope,
sorry to hear about wreck. Kids ok and the car ain't hurt bad.
Google how to adjust the tv cable first, that is what I would do.
There is a plastic piece on the throttle lever that breaks.