Issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smoky02 · 05-25-2013, 05:29 PM

Alright my swap is done but I'm having a few problems that I was hoping someone on here could help me out with. When she idles she runs good. But when I'm driving she has a few times that she skips or misses. Also when I start it I have to feather the gas like its still carbed. Also when I pull up to a light and leave it in drive it lurches, but if I put it back in neutral it idles smooth. If anyone's knows what could be causing these problems pleases let me know.

Brandon
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smoky02 · 05-25-2013, 05:31 PM

Mods please move to the LS swap section
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vannatta20 · 05-26-2013, 01:41 AM

Best bet would be to get a scan tool and see what's going on.
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BR3W CITY · 05-26-2013, 02:13 AM

See if its throwing a code, and which one. If its actually misfiring and stumbling, you've got things like the plugs, wires and coils to look at. Things like a dirty or stuck injector can cause bucking and stumbling as well.

When the engines' in neutral, there isn't any load on it so those problems might not be as obvious over the regular shakes and noises of a cammed ls.

Also things like a vacuum leak, issue with the tune, improperly hooked up brake switch causing issues with the trans etc.

smoky02 · 05-26-2013, 11:44 AM

The only code I'm throwing is p0101. And it's not consistent that makes me think it's not in the ignition system.
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Critter · 05-26-2013, 10:42 PM

Quote:

Originally Posted by smoky02

The only code I'm throwing is p0101. And it's not consistent that makes me think it's not in the ignition system.
Posted via Mobile Device

That's a MAF trouble code, assuming your ECM is still MAF based it could be throwing off your tune in all kinds of ways. Where did you put the MAF in relation to the throttle body? Also, is it new or old (did it come with a salvaged motor?)

vannatta20 · 05-26-2013, 02:03 PM

Check your fuel pressure and spark plugs
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smoky02 · 05-26-2013, 04:48 PM

What should my fuel pressure be at?
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vannatta20 · 05-26-2013, 06:17 PM

In the 50'S psi range.
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smoky02 · 05-27-2013, 07:30 PM

The MAF is new from the parts store. And it's run at the end of my cold air intake.

Critter · 05-27-2013, 08:35 PM

Quote:

Originally Posted by smoky02

The MAF is new from the parts store. And it's run at the end of my cold air intake.

Well all that sounds fine. I would look and make sure the wires aren't cut or rubbed by accident, maybe chafed on something? Also it's possible you over oiled your air filter element and some of it made its way onto the MAF. I doubt that would cause your symptoms, but it would throw the code. A bad MAF wire somewhere could be causing your issues however.

vannatta20 · 05-28-2013, 11:52 AM

I had that code as well. I just cleared it and it hasn't came back. I've ran it a few times without the maf connected testing things. Clear the code and keep checking the basics.
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05-25-2013, 05:29 PM	#1
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Issues Alright my swap is done but I'm having a few problems that I was hoping someone on here could help me out with. When she idles she runs good. But when I'm driving she has a few times that she skips or misses. Also when I start it I have to feather the gas like its still carbed. Also when I pull up to a light and leave it in drive it lurches, but if I put it back in neutral it idles smooth. If anyone's knows what could be causing these problems pleases let me know. Brandon Posted via Mobile Device __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

05-25-2013, 05:31 PM	#2
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Re: Issues Mods please move to the LS swap section Posted via Mobile Device __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

05-26-2013, 01:41 AM	#3
vannatta20 Registered User Join Date: Oct 2011 Location: Las Vegas, NV Posts: 291	Re: Issues Best bet would be to get a scan tool and see what's going on. Posted via Mobile Device

05-26-2013, 02:13 AM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Issues See if its throwing a code, and which one. If its actually misfiring and stumbling, you've got things like the plugs, wires and coils to look at. Things like a dirty or stuck injector can cause bucking and stumbling as well. When the engines' in neutral, there isn't any load on it so those problems might not be as obvious over the regular shakes and noises of a cammed ls. Also things like a vacuum leak, issue with the tune, improperly hooked up brake switch causing issues with the trans etc. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

05-26-2013, 11:44 AM	#5
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Re: Issues The only code I'm throwing is p0101. And it's not consistent that makes me think it's not in the ignition system. Posted via Mobile Device __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

05-26-2013, 02:03 PM	#7
vannatta20 Registered User Join Date: Oct 2011 Location: Las Vegas, NV Posts: 291	Re: Issues Check your fuel pressure and spark plugs Posted via Mobile Device

05-26-2013, 04:48 PM	#8
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Re: Issues What should my fuel pressure be at? Posted via Mobile Device __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

05-26-2013, 06:17 PM	#9
vannatta20 Registered User Join Date: Oct 2011 Location: Las Vegas, NV Posts: 291	Re: Issues In the 50'S psi range. Posted via Mobile Device

05-27-2013, 07:30 PM	#10
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Re: Issues The MAF is new from the parts store. And it's run at the end of my cold air intake. __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

05-28-2013, 11:52 AM	#12
vannatta20 Registered User Join Date: Oct 2011 Location: Las Vegas, NV Posts: 291	Re: Issues I had that code as well. I just cleared it and it hasn't came back. I've ran it a few times without the maf connected testing things. Clear the code and keep checking the basics. Posted via Mobile Device

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