I ran my car at Maxus today and found out that I am losing about 15 HP and 15 lb-ft. as compared to everyone else that was running stock. I've also noticed that the plot was very rough as compared to others today. Anyone have any ideas? BTW, times were 16.3@85, RT of .57 w/ a 2.42 60FT.

 

U sure you running on all 6 cylinders? Perhaps you need a tuneup as well. Something must be wrong with your car.

 

Wouldn't that trip a MIL? I checked all 6 plugs tonight, and they all look EXACTLY the same, the tips are fine and there is a slight amount of browning on the white part, with no apparent oil on the plug and no BIG black dots. As for the 'tune up', that consists of mostly changing the spark plugs, because the timing and all other aspects are controlled by the ECU. I heard a theory about a knock sensor malfunction,which wouldn't trip the ECU but would retard timing but I have heard 0 pinging so far. BTW, these are NGK OEM plugs, but in the 6 (colder) heat range.

 

A rough plot is usually ignition problems. Maybe the plugs are too cold.

wdave

 

hey.. how about i race you with only 3 of my cylinders

 

After checking the plugs at home last night, I drove around for about 5 minutes with only 4 cylinders firing(forgot to plug the rear centermost coils back in). The idle was a little rough and the car was even more underpowered, but its wasn't that bad.

 

I had the knock sensor problem. It will not trip a CE light. you will have to read the code from the ECU or hook up a ECU scanner if you have one.


Ant

 

I'm gonna have to do that too today.

 

OK, I changed the plugs to the NGK 5s, changed the fuel filter, moved my Ambient Air Temperature Sensor back to the right place (someone had moved it to the area between the throttle body and the MAFS) and checked the compression. I got the following readings:

Cylinder 1:160
Cylinder 2:150
Cylinder 3:145
Cylinder 4:150
Cylinder 5:145
Cylinder 6:150

They are a bit on the low side, but still within spec, and within 15 of each other. What else am I missing? BTW, the MIL codes were 0304, 0201 and 0102 after the compression test. THe car feels slightly stronger, but without a dyno, I can't appreciate it at all.

 

Knock Sensor

Mass Air Flow Sensor

Ignition Signal Circuit

Wow, thats some serious stuff ya got there!!

 

Sorry, that was AFTER the compression test. I had 0505 before that. Those should show up after the compression test, at least I think so.

 

greggerz.. my buddy .. my pal.. sup.. i got a dyno friend up in Manchester.. don't know how much he charges.. but hey.. we can find out and we can all go up one day.. my cousin wants to dyno his GS and my other cousin his 97 max.. let me know if you are interested

 

I'm DEFINITELY in. I have a stock one, want a stock + Y and exhaust one, then get a SC one.

 

i will see .. i will let you know ..

 

Thank you. I figgure that it couldn't be right if I was only .2 seconds behind other cars with similar setups and I ave a 150 lb. heavier car with bigger rims, colder plugs, etc.

 

Oh yeah, I forgot to say that I tightened my throttle cable today too, very little slack now.