Hiccups when starting cold and sometimes when warm

AviatorBimmerFL · 12-16-2016, 05:51 AM

Hey peeps,

I've noticed lately that when I start my car, it will have this intermittent hiccups while idling and warming up. It sort of resembles misfires but then it settled down.

I have ran Carly for BMW several times and I do not have any misfire, etc faults.

- Spark plugs are new

- Coils, as far as I know, are still original coils (car has 145K miles)

- Walnut blasting was done 46K ago, so this is due for a nice blasting.

Could my hesitation at idle be fouled up intake valves? Or can I still have bad coils and not throw any codes?

I am thinking of purchasing all 6 new Delphi coils but not sure if I should wait until codes relating to bad coils start popping up.

I am ordering the walnut blaster kit today, because I know this is due and needs to be done.

Any help will be appreciated.

Thanks!

bloppitybloop · 12-16-2016, 07:05 AM

Sounds like it could be injectors.

MadeInPhilly · 12-16-2016, 07:58 AM

injectors

AviatorBimmerFL · 12-16-2016, 08:08 AM

Injectors? Ouch!

RCOLEMAN545 · 12-16-2016, 08:14 AM

Check your spark plugs and see if any of them have a strong fuel smell. Easy way to spot a leaking injector. I had a similar problem, and fresh coils and a walnut blast solved my problem. 2007 with 95K miles, still on the original injectors. Good luck.

AviatorBimmerFL · 12-16-2016, 08:23 AM

Quote:

Originally Posted by RCOLEMAN545

Check your spark plugs and see if any of them have a strong fuel smell. Easy way to spot a leaking injector. I had a similar problem, and fresh coils and a walnut blast solved my problem. 2007 with 95K miles, still on the original injectors. Good luck.

I will check the plugs and do the following:

1. Walnut blast
2. Coils
3. Injectors

Hopefully 1-2 fixes the issue and 3 can hold strong a bit longer.

FEDE/E92 · 12-16-2016, 09:07 AM

I'm having same issues, I have new plugs, coils, fuel pump. Quick way to check your injectors is to leave the car sitting overnight took out plugs see if they were wet or smell like fuel and nothing also if you can datalog your afr for each bank when you letting off the throttle it should go to a number like 234 I think instantly and stay there. Leaning towards intakes valves. It's been a while since I had my valves blasted.

12-16-2016, 05:51 AM	#1
AviatorBimmerFL Second Lieutenant 55 Rep 266 Posts Drives: 2007 BMW 335i E92 Join Date: Jul 2016 Location: Orlando, FL iTrader: (2)	Hiccups when starting cold and sometimes when warm Hey peeps, I've noticed lately that when I start my car, it will have this intermittent hiccups while idling and warming up. It sort of resembles misfires but then it settled down. I have ran Carly for BMW several times and I do not have any misfire, etc faults. - Spark plugs are new - Coils, as far as I know, are still original coils (car has 145K miles) - Walnut blasting was done 46K ago, so this is due for a nice blasting. Could my hesitation at idle be fouled up intake valves? Or can I still have bad coils and not throw any codes? I am thinking of purchasing all 6 new Delphi coils but not sure if I should wait until codes relating to bad coils start popping up. I am ordering the walnut blaster kit today, because I know this is due and needs to be done. Any help will be appreciated. Thanks! __________________ 2007 335i E92 FBO \| MHD Stage 2+ 93 octane \| xHP Stage 3 \| Fuel-It! Stage 2 LPFP \| VRSF 7" FMIC \| VRSF Catless Downpipes \| ER Chargepipe \| HKS SSQV4 BOV \| Ultimate Racing CAI
	Appreciate 0 Tweet Quote

12-16-2016, 07:05 AM	#2
bloppitybloop Major 393 Rep 1,371 Posts Drives: 2007 335i Join Date: Mar 2014 Location: Wisconsin iTrader: (1)	Sounds like it could be injectors.
	Appreciate 1 AviatorBimmerFL55.00 Quote

12-16-2016, 07:58 AM	#3
MadeInPhilly First Lieutenant 43 Rep 301 Posts Drives: E30 318is, E90 335i, 03 GTI Join Date: Sep 2009 Location: Dallas, TX iTrader: (0)	injectors
	Appreciate 1 AviatorBimmerFL55.00 Quote

12-16-2016, 08:08 AM	#4
AviatorBimmerFL Second Lieutenant 55 Rep 266 Posts Drives: 2007 BMW 335i E92 Join Date: Jul 2016 Location: Orlando, FL iTrader: (2)	Injectors? Ouch! __________________ 2007 335i E92 FBO \| MHD Stage 2+ 93 octane \| xHP Stage 3 \| Fuel-It! Stage 2 LPFP \| VRSF 7" FMIC \| VRSF Catless Downpipes \| ER Chargepipe \| HKS SSQV4 BOV \| Ultimate Racing CAI
	Appreciate 0 Quote

12-16-2016, 08:14 AM	#5
RCOLEMAN545 Liberty or Death 60 Rep 90 Posts Drives: 2007 E92 335i Join Date: Nov 2015 Location: South Carolina iTrader: (0) Garage List 2007 E90 BMW 335i [0.00]	Check your spark plugs and see if any of them have a strong fuel smell. Easy way to spot a leaking injector. I had a similar problem, and fresh coils and a walnut blast solved my problem. 2007 with 95K miles, still on the original injectors. Good luck. __________________ 2017 BMW 340i 2007 E92 BMW 335i 2007 E90 BMW 335i - Sold
	Appreciate 1 Quote

12-16-2016, 09:07 AM	#7
FEDE/E92 Lieutenant 105 Rep 544 Posts Drives: 2007 BMW 335i Join Date: Jun 2012 Location: Vacaville, CA iTrader: (3)	I'm having same issues, I have new plugs, coils, fuel pump. Quick way to check your injectors is to leave the car sitting overnight took out plugs see if they were wet or smell like fuel and nothing also if you can datalog your afr for each bank when you letting off the throttle it should go to a number like 234 I think instantly and stay there. Leaning towards intakes valves. It's been a while since I had my valves blasted.
	Appreciate 0 Quote