RPMs will not go past 2,000?

Also, when I hit the gas pedal the A/C compressor shuts off. Then turns back on once I let off.

Hi,

Vehicle AC systems are designed to be turned off under heavy acceleration to reduce the load on the engine. If you are pressing the pedal to the floor, that may be what is happening.

Next, do you have to hold the throttle to the floor for it to slowly rev to 2K RPMs? Let me know that. And I have one last question. Does the check engine lamp stay on or flash while the engine is running? If it does, the next step would be to have the computer scanned for diagnostic trouble codes so we can narrow things down.

Here is a quick video showing how it's done:

https://youtu.be/YV3TRZwer8k

Let me know as much as you can and if possible, scan the computer if the light is staying on.

Take care,

joe

Yes, I have to hold it to the floor for it to reach 2,000. But no, the check engine light isn’t on at all nor comes on.

Hi,

The idea that you hold it to the floor to achieve this could be caused by several different things. For example, there could be a timing issue, an issue with the PCM, a fuel pressure-related issue, plugged catalytic converter, a large engine vacuum leak, and so on.

Are there any odd odors when it's running? For example, do you hear anything that sounds like a restriction in the exhaust? Also, when you hold it to the floor, do you notice any black or gray smoke from the exhaust?

What I would recommend is this. In an effort to narrow things does a bit, I would have the can-bus scanned for codes. CAN stands for controller area network. Basically, the different modules are tied together via a few wires so they can communicate with each other. This type of scan will retrieve codes regardless of the module storing them.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know.

Joe

There are no odors, or any smoke and I scanned the car and there’s no codes that’s what makes it so difficult to diagnose.

But I have noticed on a cold start that the left side exhaust puts out smoke and the right side barely lets any out. I don’t know if that means anything.

Hi,

What color is the smoke that comes from the left side? Is it possible for you to record it starting and running and upload it for me to hear?

Let me know.

Joe

Yes, and white.

But I noticed today I changed out the throttle body and the car let me rev up past 2,000 but it slowly climbs still. Once I relearn it, it won’t let me pass 2,000.

Could the white smoke you mentioned be an indication of a head gasket-related issue? Coolant burns white. Is there any evidence of coolant usage?

Let me know. Also, if you could let me know the short-term fuel trims, that may help me. I'm surprised there are no codes set. Did you scan the can-bus?

Let me know.

Take care,

Joe

Here’s a video of the cold start. But this morning I did notice a smell I just couldn’t quite describe it.

Hi,

I watched the video and questioned if that is just steam. What was the outside temperature when you recorded this?

Also, you indicated an odor. Was it a sweet smell that could indicate engine coolant or did it seem more like a rich fuel mixture?

Let me know,

Joe

It was roughly 50 degrees or so when I recorded that and no coolant it smelled kind of rotten. But I checked my data stream and noticed that my absolute throttle position is reading 0.0% even when pressing the pedal, it doesn’t move.

Here are some pictures of my data stream.

Hi,

Check the throttle position motor wiring connector to make sure it isn't damaged or corroded.

I attached a pic below of the throttle motor.

Let me know what you find.

Joe

Thanks, I’ll do that in the morning and let you know what I find.

So the harness and all the wiring looks good.

The car actually has two codes now.
P2135 and P0507.

Both codes are related to the throttle position sensor. At this point, we need to go through the diagnostics to see what is causing the problem.

If you look below, I attached the diagnostics starting with the P2135. The rationale is this. The P0507 indicates if there are additional codes, they should be checked first.

The testing does require a scan tool that can communicate with the PCM. Take a look through them and let me know if you are comfortable performing them.

Take care,

Joe

See pics below.

Thanks I can perform these !

You are very welcome. If you have a chance, let me know how things turn out for you or if you have other questions.

Take care,

Joe

So, I ended up replacing the throttle body based off what the testing showed, and it threw this code after replacing it and the car would rev past 2,000 but slowly like there’s a delay between the pedal and the throttle body. Also, my exhaust smells funny not like coolant, but it smells rotten. Oh, and one last thing was after I did the relearn procedure the car wouldn’t rev up how it was anymore.

Hi,

The smell you mentioned leads me to think either we are getting way too much fuel to the engine, or the catalytic converter is plugged. By chance, are there any strange sounds from the exhaust? If you remove the upstream oxygen sensor, does it run better?

Next, the new code is usually the result of either a wiring issue between the ECM and throttle control motor or the throttle control actuator. See pic 1 below.

Have you already checked or replaced either of them?

Let me know.

Joe

See pic below.