# Engine starts rough when warmed up & left to sit for 5-15 minutes **URL:** \ **Category:** Stock Engine-Bay Components\ **Created:** [July 9, 2012, 6:52pm UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499 "2012-07-09T18:52:23Z")\ **Posts on this page:** 9\ **Page:** 3
**Author:** ![welfare](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/w/85f322/32.png) [@welfare](https://forum.g2ic.com/u/welfare)\ **Post date:** [August 5, 2012, 7:00am UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/41 "2012-08-05T07:00:47Z")
an o2 sensor would not cause starting issues, as the o2 doesn’t engage feedback with the ecm until it’s heated to roughly 300\* until that time, it does nothing ---
**Author:** ![welfare](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/w/85f322/32.png) [@welfare](https://forum.g2ic.com/u/welfare)\ **Post date:** [August 5, 2012, 7:07am UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/42 "2012-08-05T07:07:47Z")
[QUOTE=djzachtyler;2267951] Got a line on a 98 Ford Escort ZX2 thrugh a buddy for $250 needs brakes/rotors and possibly a fuel pump &/or filter and it is good to go… figure I can use that as a DD while I prepare to really get down and dirty with the teg :)[/QUOTE] not worth the trouble, IMO. needs fuel pump means not running. who knows if it actually is the pump or not. that and the brakes make this a certified money pit on the rise. up to you, of course. but i’d be weary ---
**Author:** ![djzachtyler](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/d/a183cd/32.png) [@djzachtyler](https://forum.g2ic.com/u/djzachtyler)\ **Post date:** [August 5, 2012, 4:46pm UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/43 "2012-08-05T16:46:02Z")
[QUOTE=welfare;2267980]an o2 sensor would not cause starting issues, as the o2 doesn’t engage feedback with the ecm until it’s heated to roughly 300\* until that time, it does nothing[/QUOTE] but wouldn’t this sort of explain why the starting issues only happened while the engine was still hot? cold it started fine, hot it would have a rough time if left to sit for a few minutes… IDK but since the oil change and o2 sensor replacement the issue is gone… ---
**Author:** ![djzachtyler](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/d/a183cd/32.png) [@djzachtyler](https://forum.g2ic.com/u/djzachtyler)\ **Post date:** [August 5, 2012, 4:54pm UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/44 "2012-08-05T16:54:00Z")
> [@welfare;2267981](#): > > not worth the trouble, IMO. needs fuel pump means not running. who knows if it actually is the pump or not. that and the brakes make this a certified money pit on the rise. up to you, of course. but i’d be weary it does run but has an issue where it stalls out when stopping at a red light. knowing this model of escort it usually is an indicator of a fuel filter or possibly the pump starting to go… OFC I could be wrong also as I am just a hobby mechanic. Brakes are pretty cheap on this one I already checked it out. should be able to get it all in order for maybe 400 total. then flip it for 1k after I am done with it. it would only be a temp while I work on the teg anyways. either way for 250 bucks what’s the harm lol. registration is current on a PNO so I can at least get it home up on stands and give it a once over. if it is more trouble than it is worth, I can always resell it for what I paid if not a little more. ---
**Author:** ![welfare](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/w/85f322/32.png) [@welfare](https://forum.g2ic.com/u/welfare)\ **Post date:** [August 5, 2012, 7:25pm UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/45 "2012-08-05T19:25:22Z")
[QUOTE=djzachtyler;2268003]but wouldn’t this sort of explain why the starting issues only happened while the engine was still hot? cold it started fine, hot it would have a rough time if left to sit for a few minutes… IDK but since the oil change and o2 sensor replacement the issue is gone…[/QUOTE] yea, my bad. went back and read the original post. makes sense ---
**Author:** ![welfare](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/w/85f322/32.png) [@welfare](https://forum.g2ic.com/u/welfare)\ **Post date:** [August 5, 2012, 7:28pm UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/46 "2012-08-05T19:28:21Z")
[QUOTE=djzachtyler;2268004]it does run but has an issue where it stalls out when stopping at a red light. knowing this model of escort it usually is an indicator of a fuel filter or possibly the pump starting to go… OFC I could be wrong also as I am just a hobby mechanic. Brakes are pretty cheap on this one I already checked it out. should be able to get it all in order for maybe 400 total. then flip it for 1k after I am done with it. it would only be a temp while I work on the teg anyways. either way for 250 bucks what’s the harm lol. registration is current on a PNO so I can at least get it home up on stands and give it a once over. if it is more trouble than it is worth, I can always resell it for what I paid if not a little more.[/QUOTE] i suppose as a temp it’d be alright. just made it sound like it was a bit of a POS. guess not though ---
**Author:** ![djzachtyler](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/d/a183cd/32.png) [@djzachtyler](https://forum.g2ic.com/u/djzachtyler)\ **Post date:** [August 6, 2012, 7:28pm UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/47 "2012-08-06T19:28:18Z")
FYI Welfare, I really appreciate all of your input. thi forum is full of lot of good input, but hving a member like yourself has really helped me gain alot more knowledge about my car… Thanks! ---
**Author:** ![welfare](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/w/85f322/32.png) [@welfare](https://forum.g2ic.com/u/welfare)\ **Post date:** [August 7, 2012, 4:34am UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/48 "2012-08-07T04:34:31Z")
hey, thanks man. glad to hear that. this forum is chalked full of great members and info. i just try to give back whenever possible. cheers. and glad you got your issue sorted ---
**Author:** ![djzachtyler](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/d/a183cd/32.png) [@djzachtyler](https://forum.g2ic.com/u/djzachtyler)\ **Post date:** [August 7, 2012, 6:33pm UTC](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499/49 "2012-08-07T18:33:35Z")
I wholeheartedly agree… [Previous page](https://forum.g2ic.com/t/engine-starts-rough-when-warmed-up-left-to-sit-for-5-15-minutes/96499.md?page=2)