Shows all cylinders misfiring

Asked by Jul 30, 2016 at 09:38 AM about the 2003 Hyundai Sonata Base

Question type: Maintenance & Repair

At first it didn't sound right to me but no engine light.  Then the engine light
came on took it to my mechanic his reading said all cylinders misfiring,  The
cylinders are all new the plugs and wires are new EGR is new  the cam
senser is new there is another sencer that I have in it as well. The timing
belt has been replaced. The first thing he did was put some stuff in for
water in the gas, then he used seafoam blew out a lot of carbon. Then the
rest are the parts being replaced and no result. Any ideas?

2 Answers

13,925

Locate a mechanic who can diagnose and service your vehicle.. timing was probably done wrong.. Whenever you hear of a guy trying to "fix" things with GARBAGE products like Seafoam or Lucas or other Voodoo products BEWARE

he did the sea foam for carb build up of cheap gas with water. It blew tons of carb out that wasn't a good thing to do? He knows I don't have a lot of money and he is a real mechanic he put his diagnostic machine to it and it always reads the same thing. And most of the parts were already new before this problem except cylinders 3and 4 which are new now. He has been working on my car for over 10 years I have had no problem I'm usually there when he is working on it. I have also had auto zone diagnose it same code and my son had his friend hook his up and same code all the time. Thats what so puzzling. ugh!!

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