# 2004 Toyota Corolla cranks but won’t start after long sit **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** corolla, toyota\ **Created:** [December 7, 2018, 11:40am UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376 "2018-12-07T11:40:40Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![NayyarFaruqui](https://avatars.discourse-cdn.com/v4/letter/n/df788c/32.png) [@NayyarFaruqui](https://community.cartalk.com/u/NayyarFaruqui)\ **Post date:** [December 7, 2018, 11:40am UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/1 "2018-12-07T11:40:40Z")
Once the engine is started after more than 8 to 10 hours the engine cranks but does not start. However, if I attempt cranking within few hours 3 to 5 hrs, there is no problem. ---
**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\ **Post date:** [December 7, 2018, 1:13pm UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/2 "2018-12-07T13:13:15Z")
Check the battery because It could be weak.How old is it? ---
**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\ **Post date:** [December 7, 2018, 3:48pm UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/3 "2018-12-07T15:48:05Z")
If the engine cranks the battery is not the reason for a non-start. This car may need to get the “key dance” after it’s been sitting. ---
**Author:** ![NayyarFaruqui](https://avatars.discourse-cdn.com/v4/letter/n/df788c/32.png) [@NayyarFaruqui](https://community.cartalk.com/u/NayyarFaruqui)\ **Post date:** [December 8, 2018, 8:27am UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/4 "2018-12-08T08:27:21Z")
Thank you. To give you more details see following: 1.The Battery is perfect. 1. It it starts it does not give problem unless remains switched off for more than 10 hrs. 2. All plugs new. 3. Ignition coil is serviceable. Fuel Pump Checked - OK & holding pressure. 1. All HT leads perfect. 2. Crank Sensor is OK. 3. The first start problem happens 5 out of 10 times. As per my Mechanic, the car has been running on compressed gas for quite some time. Therefore there could be deterioration of valves resulting in reduction of compression when the engine is cold. Later when the engine gets hot after it starts, the compression gets OK. I request for an expert opinion. THANK YOU. ---
**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\ **Post date:** [December 8, 2018, 9:27pm UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/5 "2018-12-08T21:27:13Z")
> [@NayyarFaruqui](#): > > the car has been running on compressed gas for quite some time Compressed natural gas? Not gasoline (petrol)? “for some time” = car was converted to CNG? ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [December 8, 2018, 9:29pm UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/6 "2018-12-08T21:29:56Z")
Perform a dry compression test on all 4 cylinders and report back to us, please We’ll tell you if the values are acceptable . . . or not ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 9, 2018, 1:55am UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/7 "2018-12-09T01:55:57Z")
A compression test is a good idea, but the theory that the compression is much less 10 hours later than 4 hours later seems unlikely. This sounds like a fuel pressure problem to me. Has the fuel rail pressure been measured when attempting to start at the 10 hour mark? It could just be leaking down very slowly. Often the spec is that it not leak down more than a certain % in 30 minutes, something like that. But in your case that might not be an adequate test method. If it isn’t a f uel pressure problem, then visually checking for a healthy spark at a spark plug during cranking when this happens is probably what I’d do. Also, a quick check to see if there is any gasoline in the vacuum line connected to the fuel pressure regulator makes sense. There shouldn’t be any. ---
**Author:** ![NayyarFaruqui](https://avatars.discourse-cdn.com/v4/letter/n/df788c/32.png) [@NayyarFaruqui](https://community.cartalk.com/u/NayyarFaruqui)\ **Post date:** [December 9, 2018, 2:22am UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/8 "2018-12-09T02:22:05Z")
Yes it had been running on CNG=Compressed Natural Gas. ---
**Author:** ![NayyarFaruqui](https://avatars.discourse-cdn.com/v4/letter/n/df788c/32.png) [@NayyarFaruqui](https://community.cartalk.com/u/NayyarFaruqui)\ **Post date:** [December 9, 2018, 2:24am UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/9 "2018-12-09T02:24:22Z")
The Gasoline car was converted and installed with CNG kit. ---
**Author:** ![NayyarFaruqui](https://avatars.discourse-cdn.com/v4/letter/n/df788c/32.png) [@NayyarFaruqui](https://community.cartalk.com/u/NayyarFaruqui)\ **Post date:** [December 9, 2018, 2:34am UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/10 "2018-12-09T02:34:00Z")
I would like to also inform that after having cranked the engine 8 to 10 times, I give a break of 10 to 20 minutes after which it starts in one or two cranks. Could it be Valves or Fuel problem ? ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [December 9, 2018, 5:11am UTC](https://community.cartalk.com/t/2004-toyota-corolla-cranks-but-won-t-start-after-long-sit/130376/11 "2018-12-09T05:11:56Z")
> [@NayyarFaruqui](#): > > Could it be Valves or Fuel problem ? If you perform that compression test, you’ll be much closer to answering one of those questions You can always tee in a fuel pressure gauge, after you post those compression numbers for all 4 cylinders