Narrative:

We pushed off the gate starting engine #2. We taxied out with the plan to start the #1 engine [later in the taxi] after we saw the lineup. We then switched over to tower. Just as we were pulling up to stop they cleared us on to the runway; so I ran the before takeoff checklist just reading through it and the captain answering. I was the flying pilot so I said set thrust and he said thrust set. I stated twice that I was using a ton of rudder when he said that we do not have engine #1; abort takeoff. We did not travel far; took a breath and did checklist. We then started engine #1; went through all the checklist from delayed engine start and on; very diligently. We then called tower and proceed to taxi back to the runway and took off. I did ask the captain if we needed to fill out an as soon as possible. He said let me think about it and later said he thought we would be fine. The event has not set well with me so I reached out to talk to someone about it and feel like I need to submit it even though it's past the 24 hour mark.I feel like some of the threats were being rushed and therefore not properly doing the checklists. I wish the delayed engine start had to be verbalized so that both captain and first officer had to acknowledge that you have two good engines. Slow down. Don't make anyone rush you; and do what you feel is right even if it's against the recommendation of others.

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Original NASA ASRS Text

Title: EMB-145LR First Officer reported starting the takeoff roll with only one engine operating after being rushed at the end of a single-engine taxi.

Narrative: We pushed off the gate starting engine #2. We taxied out with the plan to start the #1 engine [later in the taxi] after we saw the lineup. We then switched over to Tower. Just as we were pulling up to stop they cleared us on to the runway; so I ran the before takeoff checklist just reading through it and the Captain answering. I was the flying pilot so I said set thrust and he said thrust set. I stated twice that I was using a ton of rudder when he said that we do not have engine #1; abort takeoff. We did not travel far; took a breath and did checklist. We then started engine #1; went through all the checklist from delayed engine start and on; very diligently. We then called Tower and proceed to taxi back to the runway and took off. I did ask the Captain if we needed to fill out an ASAP. He said let me think about it and later said he thought we would be fine. The event has not set well with me so I reached out to talk to someone about it and feel like I need to submit it even though it's past the 24 hour mark.I feel like some of the threats were being rushed and therefore not properly doing the checklists. I wish the delayed engine start had to be verbalized so that both Captain and FO had to acknowledge that you have two good engines. SLOW DOWN. Don't make anyone rush you; and do what you feel is right even if it's against the recommendation of others.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.