Viso competed in the newly united IndyCar Series in 2008 for HVM Racing.
He made his first series start in the first oval race of his career on March 29.
His next start, at St. Petersburg, was a superb performance ending with a fourth-place finish.
At Milwaukee he ended with an eighth place.
Shortly after the Watkins Glen race (in which he finished 10th but forced Vítor Meira off the track, causing Meira to run back onto the track to confront Viso on the next lap) he was diagnosed with the Mumps and was forced to withdraw from the next race.
Viso finished 18th overall in the 2008 series and has signed a contract to drive for HVM in 2009.
On February 21, 2010 KV Racing confirmed that Viso would drive the No.
8 car for the team for the entire 2010 season.

For the 2011 IndyCar campaign, Viso remained with KV Racing.
He showed flashes of speed, particularly in Brazil where he was in contention for a win.
He remained one of the more accident-prone drivers in the series, which led to questions about his seat for 2012 .
Viso finished 18th in the IZOD IndyCar Series championship on the strength of four top-10 finishes with a season best seventh place showing in Texas Race No.
2.

For 2013 Viso remained in the IndyCar Series with Andretti Autosport, in the No.
5 with sponsorship from oil company PDVSA, recording a best finish of 4th at Milwaukee and finishing 15th in the final points standings.
Ahead of the series finale at Fontana, Viso was replaced at the last minute by Carlos Munoz, citing illness and claiming to be unable to travel.
His sudden absence was curious however, as the same week reports surfaced in Venezuela alleging that several Venezuelan drivers participating in various series had committed fraud and engaged in illegal currency trading.
Viso later posted a letter on his Twitter account, in which he confirmed his support of the Venezuelan government and welcomed any investigation.

As of March 2014, Viso no longer has a full-time Indycar Series drive.
Viso competed in the newly united IndyCar Series in 2008 for HVM Racing. He made his first series start in the first oval race of his career on March 29. His next start, at St. Petersburg, was a superb performance ending with a fourth-place finish. At Milwaukee he ended with an eighth place. Shortly after the Watkins Glen race (in which he finished 10th but forced Vítor Meira off the track, causing Meira to run back onto the track to confront Viso on the next lap) he was diagnosed with the Mumps and was forced to withdraw from the next race. Viso finished 18th overall in the 2008 series and has signed a contract to drive for HVM in 2009. On February 21, 2010 KV Racing confirmed that Viso would drive the No. 8 car for the team for the entire 2010 season.
For the 2011 IndyCar campaign, Viso remained with KV Racing. He showed flashes of speed, particularly in Brazil where he was in contention for a win. He remained one of the more accident-prone drivers in the series, which led to questions about his seat for 2012 . Viso finished 18th in the IZOD IndyCar Series championship on the strength of four top-10 finishes with a season best seventh place showing in Texas Race No. 2.
For 2013 Viso remained in the IndyCar Series with Andretti Autosport, in the No. 5 with sponsorship from oil company PDVSA, recording a best finish of 4th at Milwaukee and finishing 15th in the final points standings. Ahead of the series finale at Fontana, Viso was replaced at the last minute by Carlos Munoz, citing illness and claiming to be unable to travel. His sudden absence was curious however, as the same week reports surfaced in Venezuela alleging that several Venezuelan drivers participating in various series had committed fraud and engaged in illegal currency trading. Viso later posted a letter on his Twitter account, in which he confirmed his support of the Venezuelan government and welcomed any investigation.
As of March 2014, Viso no longer has a full-time Indycar Series drive.
E. J. Viso