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


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!!

Your Answer

Add photo

Related Questions

  • 302 cylinder misfire 1 answer

    my 01 sonota gls six cylinder has a po302 misfire code. real rough idle and is worse in gear. also there is a weird pop sound from the engine...i changed the coil pack and it didnt change..any suggest...

    2001 Hyundai Sonata GLS


    Maintenance & Repair

  • Misfiring 5 answers

    Hi there, I am from Australia and I have a 2005 NF Sonata Elite with a 3.3 v6 engine. For as long as the past 3 years, a check light has been constantly on, stating there is an issue with the 02 senso...

    Hyundai Sonata


    Maintenance & Repair

  • What would cause a 2003 Hyundai Sonata 4 cylinder to misfire and die? 1 answer

    For no apparent reason when driving it will misfire and die. We replaced the fuel pump and fuel filter, spark plugs, wires and ignition coils and it still runs rough and misfires. Any suggestions? Th...

    2003 Hyundai Sonata


    Maintenance & Repair

  • Misfiring/Hesitation issues. 29 answers

    I love my Sonata so far, but the big issue and only issue (other then MPG, on the low end) is I have had my "Check engine light" come on and blink 3 to 5 times. I took in under warranty service and w...

    2007 Hyundai Sonata


    Maintenance & Repair

  • check engine light on 2009 accent. Codes show #1 and #3 cylinder misfire. Any input? 7 answers

    Car has not had any issues until now. Driving car after filing gas tank. Car started sputtering very bad. Check engine light came on. Checked oil and was less than a quart low. coolant level fine...

    2009 Hyundai Accent


    Maintenance & Repair

Search Hyundai Sonata Questions

Hyundai Sonata Experts

#1 toDumbToNotKnow
Reputation 1,270
#2 Tom Demyan
Tom Demyan
Reputation 1,130
#3 dandyoun
Reputation 910
View All

Related Models For Sale

Used Honda Accord"
1,263 Great Deals out of 78,694 listings starting at $1,400
Used Toyota Camry"
1,608 Great Deals out of 98,371 listings starting at $895
Used Hyundai Elantra"
839 Great Deals out of 50,803 listings starting at $1,995
Used Kia Optima"
606 Great Deals out of 31,665 listings starting at $1,700
Used Nissan Altima"
1,360 Great Deals out of 87,464 listings starting at $1,095
Used Honda Civic"
1,148 Great Deals out of 59,092 listings starting at $995
Used Hyundai Santa Fe"
637 Great Deals out of 35,618 listings starting at $800
Used Toyota Corolla"
1,417 Great Deals out of 67,100 listings starting at $1,295
Used Chevrolet Malibu"
1,151 Great Deals out of 73,044 listings starting at $695
Used Nissan Maxima"
496 Great Deals out of 24,224 listings starting at $1,500
Used Mazda MAZDA6"
235 Great Deals out of 15,058 listings starting at $1,450

Used Cars For Sale

2017 Hyundai Sonata For Sale
21,015 listings starting at $16,016
2016 Hyundai Sonata For Sale
75 Great Deals out of 7,823 listings starting at $11,573
2015 Hyundai Sonata For Sale
178 Great Deals out of 4,765 listings starting at $9,191
2014 Hyundai Sonata For Sale
101 Great Deals out of 2,025 listings starting at $7,777
2013 Hyundai Sonata For Sale
309 Great Deals out of 5,980 listings starting at $6,596