Missing at stops or when idling

Tiny
CHELSEA
  • MEMBER
  • 1995 LINCOLN CONTINENTAL
  • 4.6L
  • V8
  • FWD
  • AUTOMATIC
  • 130,500 MILES
This is a great car and usually a great ride, but last year it started missing, mostly when idling at stops or lights etc. Had Spark Plugs and leads, two x coils and all eight injectors replaced. Thought it had done the trick but within twenty four hours the missing was back. Any suggestions please?
Friday, November 4th, 2016 AT 1:43 PM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure with a gauge auto parts rent it. see link.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Friday, November 4th, 2016 AT 2:57 PM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Hi CHELSEA,

If you would like to conduct the scan yourself here is a link to an article that features written step by step instructions and pictures explaining how to do the scan yourself, also I have included a link to our YouTube channel with a how to video on code scanning.

This is applicable even if your check engine light is not on.

Most scanners are inexpensive to purchase, you can purchase one online from sites like Amazon.com

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://youtu.be/YV3TRZwer8k

Once you have the codes please get back to us so that we can further assist you. We are always happy to help.

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
Admin
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Friday, November 4th, 2016 AT 3:48 PM
Tiny
CHELSEA
  • MEMBER
  • 5 POSTS
Hi, really appreciate the replies. Have had a mechanic check for error codes and he said we needed a new ECU unit. We used a reputable parts supplier who obtained a reconditioned one with all matching numbers. Have just had a mechanic friend use his diagnostic tool and it is not showing any fault codes but no. 4 cylinder is still missing and when he removed the lead to no. 4 injector, the engine didn’t change at all (hope I’ve explained that correctly). Have you or anyone else any ideas please. Reply asap would be really appreciated as mechanic friend from UK is staying with us for a few more days. Many thanks
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Wednesday, November 9th, 2016 AT 12:00 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check resistance of injector if still doing it as well as check for a vacuum leak. Resistance should be 11-18 ohms
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Wednesday, November 9th, 2016 AT 12:37 PM
Tiny
CHELSEA
  • MEMBER
  • 5 POSTS
Hi, still no code or engine light but vehicle has now had new spark plugs, leads, coils, ecu, injectors (have all been checked and resistance fine) and although definitely better, it is still missing slightly when idling. Any ideas whilst I still have visiting mechanic friend. Regards
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Tuesday, November 15th, 2016 AT 4:34 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Has he checked compression? If ok then open the valve cover and see if cam is worn down or broken valve spring etc.
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Wednesday, November 16th, 2016 AT 6:48 AM
Tiny
CHELSEA
  • MEMBER
  • 5 POSTS
Thanks, have passed on info. Could it possibly be idle air intake valve? Don’t know where to find it on my 1995 Lincoln Continental.
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Saturday, November 19th, 2016 AT 9:11 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Yes it may be that but scanning for codes should have brought that see if it was. Or a vacuum leak.
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Saturday, November 19th, 2016 AT 11:12 AM

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