My Cadillac STS jerks between 1,500 and 2,500 RPMs. Mechanic says it is not the transmission. What is it?

30

Asked by Jul 18, 2013 at 09:20 PM about the 2006 Cadillac STS V6

Question type: Maintenance & Repair

Told it wasn't the transmission. They replaced the engine coils, and spark plugs. What is
the issue?

9 Answers

the EGR valve.~

3 out of 3 people think this is helpful.

Idle fast?

30

That would cause the car to jerk?

1 out of 1 people think this is helpful.
30

Idles just below 1500 rpms. The mechanic is also replacing the timing chain. I thought it was the tranny at first but they ran tests on it saying it was fine so they replaced all the coils and spark plugs and took it for a test drive and told me it was fine but heard a clink sound so they think its the timing chain. You the EGR valve would cause this?

1 out of 1 people think this is helpful.

looking for an example (that don't ask for money)~

https://www.youtube.com/watch?v=Roz6jVN7S-k

2 out of 2 people think this is helpful.
30

Can you copy and paste the egr valve cleaning link again?

1 out of 1 people think this is helpful.

the timing chain will continue to stretch until the wear shoe has run out of real estate, the stretched chain can be fixed....a broken one will destroy nearby components (like the oil pump, for example)~ if it sounds like a coffee can full of marbles would change the timing chain immediately~

at first I thought what's the big dealie-o, opens up on decel, closes on acceleration...but it is more complicated than that...has to introduce exhaust gas if the combustion temperatures get too hot...as measured by the MAF sensor and 02 sensors~...yeeeef~

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