Author Topic: Hesitation after Injector Cleaner  (Read 9359 times)

ecalder

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Hesitation after Injector Cleaner
« on: April 14, 2011, 08:52:00 AM »
Hey guys my car has been running stellarly for the last year and a half! I feel like I have really lucked out with the way the PO maintained the car.

My buddy bought a pack of fuel injector cleaner, it was buy one get one free. So I added the other one to my tank figuring it couldn't hurt much.

Well now my engine is doing somthing funny. When I'm in neutral and I accelerate (medium acceleration, not pedal to the floor and not sunday driving either) the engine will hesitate at first, almost up to 4,000 RPM and then everything is perfect after that. It's almost like it is missing a cylinder or something and then as the RPMs get higher it catches back on.

Has this ever happened to any of you?

I have a COP kit on there, which I installed myself over a year ago with no problems so far. Also I have not changed the injectors nor do I know when the last time they were changed.

Let me know if this is a common problem! I'm on my 3rd tank of gas since the fuel injector cleaner, I thought maybe it would go away after that stuff flowed through but no dice. Also I just replaced all my rubber fuel lines and fuel filter and it seems that the problem is a bit worse than before?

Oh and PO changed spark plugs day before he sold it to me.

Any ideas?

THANKS.

Erick

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!

ecalder

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Hesitation after Injector Cleaner
« Reply #1 on: April 14, 2011, 01:11:01 PM »
Hmmm I decided to start from the easiest and pull the plugs... One was missing the prongs completely. Going to get new plugs! Hopefully this will do it...

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!

Brian318is

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Hesitation after Injector Cleaner
« Reply #2 on: April 14, 2011, 02:24:25 PM »
My first choice would just replace the plugs and injectors. I bought OEM plugs and mustang 4 pintle injectors off of ebay, car is running flawlessly.

DesktopDave

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Hesitation after Injector Cleaner
« Reply #3 on: April 14, 2011, 04:57:06 PM »
LOL, hesitation from missing plug electrodes!  Glad you figured it out.  What brand are the plugs?

Maybe I should ask what brand the injector cleaner is...if it melted a spark plug electrode, imagine how good it'll be on valve deposits!!  :D

+1 on the Ford injectors (& new o-rings).
« Last Edit: April 14, 2011, 06:50:36 PM by DesktopDave »
'08 Karmesinrot 128i 6MT
'86 Zinnoberrot 635CSi (M30B32/G265/3.46 torsen LSD)

Sold: '97 Montrealblau 318iS, '91 Brilliantrot 318i, '91 Brilliantrot 318iS

ecalder

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One thing after the other...
« Reply #4 on: April 14, 2011, 07:14:09 PM »
Man! It's been a rough couple of days with my car!

I pulled her out of the garage yesterday afternoon to make sure all was good before today's track day. As soon as I backed up I saw a trail of fluid in the ground and it didn't take long before I realized it was gasoline! So I tracked down the pinhole leak and decided to change the hose, which was the one that went from the gas tank into the fuel filter. Well turns out to even get to the hose clamp I had to move the return hose out of the way so while I was at it I decided to change at as well, along with the fuel filter. This morning I went to drive it confident that othe fuel wasn't leaking and ran across the hesitation. So I posted about that but track time was at 3 so I decided to investigate. Luckily I found the spark plug was the culprit! Bosch +2 Platinum was what was in there and that's what i replaced them with because the ones y'all recommended on the sparkp plug recc page were not in stock immediately. So I was super pumped I drove out to the track and had a total blast I don't think my car had ever run this smoothly honestly. I attribute it to the combo of new fuel filter and plugs.

O k so i went to refuel. I topped off on accident I dont like to do that because my car smells like gas for a while after I fill up all the way (no idea why or where it comes from). Anyways at start of the third session I was going around the carousel at around 5k rpm and the power just cut out completely! I was able to immediately pit in and cruised for a few yards and when I went to accelerate again it was fine. I let it cool down for a bit to think about what could have happened then I went back out. I didn't even get down the pit before it happened again. It is like I was redlining at 5k but not with the needle bouncing at the line, it would die and if i accelerated nothing would happen then a couple of seconds later it would pick back up again.

So I decided to go home because I was worthless on the track and didn't want to get stranded in angleton! The drive home went swimmingly, but I didn't get past 5k which is around when it happened. After the 30 minute drive on the freeway I tried pushing it again and for about 5 minutes it was back to normal I could redline no problem. I was perplexed but the took a sharp turn and immediately following that it happened again, this time at 6k.

So I have no idea what's up, but since it's not a hesitation I feel like it's a fuel supply problem. Maybe changing the hoses and filter made a weak link out of the fuel pump? Is there a break in procedure for a new fuel filter I missed?

Ah and to add icing to the cake my wheels started squealing, but instead of squealing while braking which is normal after a track day with my hawk hps pads this time it was when the car was rolling. Wheel bearings? Is that the sign they're going out?

Anyways thanks for reading. I'd love to know if anyone else has experienced this? I have another track day on Sunday and id love to get it resolved before spending $150 for it to happen again!

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!

a930rocket

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Hesitation after Injector Cleaner
« Reply #5 on: April 14, 2011, 07:46:48 PM »
Sounds like either fuel starvation (filter on backwards, clogged sock on fuel pump?) or an electrical issue that cuts the pump out.

Just my WAG...
1991 318is

1987 911 Turbo

stillmatick

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Hesitation after Injector Cleaner
« Reply #6 on: April 14, 2011, 08:15:14 PM »
there's a race track in angleton? link please.

ecalder

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Hesitation after Injector Cleaner
« Reply #7 on: April 14, 2011, 08:19:58 PM »
msrhouston.com

Every other Thursday they have an event $75 for 3 three 30 minute sessions including dinner. Pretty laid back atmosphere, you should check it out...

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!

ecalder

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Hesitation after Injector Cleaner
« Reply #8 on: April 14, 2011, 08:32:39 PM »
a930 I looked at your thread on replacing your fuel lines, yours looks different than mine. My "in" side is the side that's round and my "out" side is the side that's crimped... Unless I was just really tired when I installed it. I'll have to double check tomorrow. But would it have run so smoothly for an hour on the track if it was backwards?

Fuel system is new for me. "Clogged sock on Fuel Pump" is this replaceable or do I need to replace the fuel pump altogether?

I'm worried if it is electrical then the fuel pump pressure test won't work right because it will be being cut off by the computer instead of a defect in the pump?

Excuse my ignorance, I've never even seen a fuel pump.

THANKS for the WAG!

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!

DesktopDave

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Hesitation after Injector Cleaner
« Reply #9 on: April 14, 2011, 08:43:36 PM »
I thought e30's were famous for fuel starvation on hard turns?  To the left, under 1/4 tank, IIRC.  Might just be a design problem.
'08 Karmesinrot 128i 6MT
'86 Zinnoberrot 635CSi (M30B32/G265/3.46 torsen LSD)

Sold: '97 Montrealblau 318iS, '91 Brilliantrot 318i, '91 Brilliantrot 318iS

ecalder

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Hesitation after Injector Cleaner
« Reply #10 on: April 14, 2011, 08:48:38 PM »
I've heard that, but I have a full tank for sure.

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!

ecalder

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Hesitation after Injector Cleaner
« Reply #11 on: April 14, 2011, 09:02:19 PM »
Does the fact I have the Mark D 93 Octane chip in there affect being able to use the mustang 4 pintle injectors?

Quote from: Brian318is;103034
My first choice would just replace the plugs and injectors. I bought OEM plugs and mustang 4 pintle injectors off of ebay, car is running flawlessly.

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!

ecalder

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Hesitation after Injector Cleaner
« Reply #12 on: April 14, 2011, 10:20:04 PM »
Stomp test gave me the dreaded 1244 camshaft position sensor code! Crap from what I read it is common although the solution not so much so...

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!

stillmatick

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« Reply #13 on: April 14, 2011, 11:17:29 PM »
what suspension you running at the track?

ecalder

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Hesitation after Injector Cleaner
« Reply #14 on: April 15, 2011, 08:13:50 AM »
IE Stage 3 Springs/Bilstein Sports - a great combo...

1991 318i 5 Speed
2004 X3 2.5 6 Speed
2011 1M June 17 Euro Delivery!