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3800 idle lope... by sco77
Started on: 08-03-2013 05:48 PM
Replies: 12 (390 views)
Last post by: Sile on 09-23-2013 01:23 PM
sco77
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Report this Post08-03-2013 05:48 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
Got my 3800sc running today, only problem I am having is after 1 minute it will start loping really bad and wont recover, if you rev it it will be fine for an additional minute then start loping again... Is there anything else besides tuning that could be wrong?

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86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
98 GTP - Some mods

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sco77
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Report this Post08-03-2013 06:52 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
Ok I think I found the problem, the intake hose after the MAF wasnt tightened down... will update thread later if I get time or tomorrow and let yall know if that was it.

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86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
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sco77
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Report this Post08-03-2013 07:04 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
Ok that wasn't it... also throws code p1351

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FIEROFLYER
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Report this Post08-03-2013 08:25 PM Click Here to See the Profile for FIEROFLYERSend a Private Message to FIEROFLYEREdit/Delete MessageReply w/QuoteDirect Link to This Post
Are you sure the idle air control motor is wired properly and working and there is no vacuum leaks. Dan

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DARN Cars now open with
Over 30 years wiring experience between cars and trade as an avionics technician in both Canadian Air Force and civilian aviation.
Over 25 years experience building and modifying cars.
Over 10 years of full Fiero engine swaps and harnesses building and still going.

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sco77
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Report this Post08-03-2013 08:30 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by FIEROFLYER:

Are you sure the idle air control motor is wired properly and working and there is no vacuum leaks. Dan



Positive on no vacuum leaks... IAC I guess I would have to test it somehow, but wouldnt that throw a code? Wouldn't it be more likely something to do with the code I actually AM throwing?

To add to the description of the problem it will idle perfectly at 800-900 RPM for a minute before this starts, and revving it will temporarily fix it... It is loping to the extremes.. 500RPM - 1500+
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86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
98 GTP - Some mods

[This message has been edited by sco77 (edited 08-03-2013).]

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sco77
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Report this Post08-03-2013 09:00 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
Tomorrow I will run continuity check on pin C1-53 and 54 to see if they are right. Anything else I should check with code P1351? My Tach is wired correctly so I know I didn't mix up the white wires.

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86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
98 GTP - Some mods

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sco77
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Report this Post08-03-2013 11:32 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
Well I found the problem, I missed both A and B on ICM harness, it's amazing it even ran I guess... I will try again tomorrow and update if it fixed the idle problem.

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86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
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sco77
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Report this Post08-04-2013 09:57 AM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
Well that fixed the code but did nothing about the running condition....

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86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
98 GTP - Some mods

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nosrac
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Report this Post08-04-2013 03:04 PM Click Here to See the Profile for nosracSend a Private Message to nosracEdit/Delete MessageReply w/QuoteDirect Link to This Post
Do you have right MAF programmed? Also, try a case learn.
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sco77
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Report this Post08-04-2013 04:34 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by nosrac:

Do you have right MAF programmed? Also, try a case learn.


Programming is by sinister and I specified my MAF model number... Wouldn't a CASE learn problem cause it to throw a code or just not run at all?

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86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
98 GTP - Some mods

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sco77
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Report this Post08-04-2013 05:28 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
That's strange I did absolutely nothing and it is idling beautifully for 15 mins now... either it fixed it self or it's a problem until operating temperature. Maybe IAC got stuck or dirt got in an injector?

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Report this Post08-04-2013 06:44 PM Click Here to See the Profile for sco77Click Here to Email sco77Send a Private Message to sco77Edit/Delete MessageReply w/QuoteDirect Link to This Post
Seems to be idling OK now, but on hot starts it hunts for about 1 second then idles at about 1100rpm for exactly 20 seconds before it drops down to 8xx, maybe that's just part of the tune.

Video (tach is off by 100rpm, remove 100rpm from total, also fan kicked in at 28 seconds so that is what caused the small dip):

http://www.youtube.com/watch?v=Z_wMgBdykqk

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86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) Build Progress eta: 8/13
98 GTP - Some mods

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Sile
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Report this Post09-23-2013 01:23 PM Click Here to See the Profile for SileClick Here to Email SileSend a Private Message to SileEdit/Delete MessageReply w/QuoteDirect Link to This Post
I'm having this same issue did you ever figure yours out?
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