I am having the following problem. I am driving at 45-55 mph and downshift to make a turn. When I accelerate, I get hesitation, a CEL, and misfiring on all cylinders. As soon as I can pull over and shut the car off. When I start it back up f it runs fine until I at some point repeat this scenario. Codes are P0133, P0153, and a code for each cylinder misfire.

 

Pizzaguy had code P0153 and never said if he cured it. CLICK

 

I will PM him and see if he has any idea what this is about. Thanks

 

Obviously you have to start with the codes that are present. A slow response from an 02 sensor will give you those codes. May not be the reason for the problem your having but never the less it has to be addressed first. Sounds more like a crank sensor going bad or intermittently failing then resetting on a restart. Sometimes when these things act like this they may not give a code.

 

I just replaced the crank sensor about a month ago after the first time it happened. Used a Bosch.

 

I did mention that I fixed the P0135 code, but I didn't mention it in THIS thread. Nuts, sorry guys. Ok, I had all sorts of misfire codes as well as O2 codes. As it turns out, the O2 codes were not bad O2 sensors, it was that the O2s were seeing stuff that the PTCM did not like. THe real issue was bad plugs and/or plug wires.

I replaced all 12 plugs and plug wires, as well as the fuel filter/regulator. ALL codes went away and the car had the pep and power is SHOULD have. I guess plugs just dont' last, they only had something like 102,000 miles and ten years on them. I do not think the fuel filter/regulator had anything to do with it, but it was time for it anyway.

As to the plugs - The center electrodes were worn down like sharp pencil tips, just peaking out of the insulation.

I used this kit at the time: NeedsWings Performance Products. Ignition Kit m112

 

With me, it was ANYTIME I demanded the car perform like a sports car. You are describing, almost exactly, what my car was doing. It was kinda fun, - I could make my CEL come on at will.

Now, if you have, say, only 30,000 miles on yours, I'd not suspect plugs. I'd think that low fuel pressure could do this as well, I guess. Or even lousy gas.

 

i concur with the plugs and wires

 

Only has 28,000 miles. Taking all the joy out of driving the car . If I am on the highway I can gun it and no problem. Someone suggested to me a clogged EGR valve. Does this seem like it could be the cause?

 

I always use Shell 93 octane gas.

 

NO. Mine actually DID fail, in the closed position (on the Graphite car). The result was that no exhaust gas flowed back into the intake EVER - resulting in a CEL and P0401 code. This meant that part of the delay in the throttle (caused by the valve being open in normal operation) was gone because the valve never opened. It gave the car more responsiveness and 'pep'. So much so, that once I got the EGR replaced, I put in an EGR cutout switch for my amusement.

Using the switch would, again, take some of the throttle delay away and make the car more responsive. The CEL would light, but once I turned the EGR back on, the CEL goes away in three drive cycles.

You know, I wonder what it would do if the EGR was stuck OPEN. Now that is something to consider, I guess. You SHOULD see a CEL and code P0402 if the valve is open all the time or too much.

 

So if you "gun it" at 45 in a TURN, you have a mess - but at 60 in a strait line, it is fine?

 

Yes, it is after I turn after downshifting usually from fith gear then 4th, 3rd, .and am in second gear. After the turn I hit the gas and a couple of hesitations and the misfiring. I am researching how an EGR valve functions. I think if the valve is stuck open it will cause misfiring. I am not an auto mechanic, I work on things that go into space. This car has gotten me interested in working on them.

 

If I had my car here, I'd hotwire the EGR open and see what it does.

 

Well, the good thing is it drives fine as long as I do not downshift and try to accelerate quickly. Appreciate your help greatly. I've gotta figure this out though. Gotten used to how fun this car is to say the least.

 

How difficult was it to change out the EGR valae?

 

I paid a shop $90 (one hour) to change it for me = that was back when the Crossfire was my Daily Driver.
Today, with the current Crossfire, I'd change it myself.

I suppose that a STUCK OPEN EGR would impair acceleration but I just don't know if it would impair it that much.