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#1 |
Registered User
Join Date: May 2010
Location: Arlington TX
Posts: 9
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350 TBI Engine Miss
I am having an issue with my 1987 Chevy R-10 with a 5.7 TBI and a 700R4 Transmission.
Symptoms: Noticing a light and hard miss at idol while in gear. details: This only happens while in gear and if the motor is warm If motor is warm and I take it out of gear there is no miss. No miss while driving at any speed. Still getting 17-18 MPG Recent Work: Complete tune-up. Changed plugs, cap, rotor, wires and timing. timed to 2 degress BTDC with the plug disconnected. disconnected ground then reconnected so computer would set advance curves. New O2 sensor and Cat. Clarifications: When I gapped the plugs, the mfg recommended .35 but my book said .45 I gapped at .35 (should I go to .45?) The truck does burn some oil. I look forward to hearing some input. thanks, |
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#2 |
Registered User
Join Date: May 2010
Location: Reno Ne-VAH-da
Posts: 594
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Re: 350 TBI Engine Miss
It sounds like a plug wire is not making contact.
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#3 | |
Conversion Truck Addicted
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
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Re: 350 TBI Engine Miss
X2
did it start to miss after the tune up? i would try see if the plug wires can be push farther down over the plug some times the wire can be at the end of the rubber boot so its just bearly making contact if that dosent work i would try another set of plug wires to see if it changes anything my diffrent make
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#4 |
Registered User
Join Date: May 2010
Location: Arlington TX
Posts: 9
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Re: 350 TBI Engine Miss
After the tune-up it ran great!!
a few tanks of gas I was getting almost 19mpg which is pretty good. It's been progressively getting worse. I haven't had time to look at it yet, but thought I would throw the post up to see if there were some suggestions other than what is on my mind. my thought is the plug gap mixed with the oil burning. I'm thinking it's causing a plug to "clog" up due to the size gap? thanks for the replies. Last edited by JC_32; 09-22-2010 at 04:48 PM. |
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#5 |
Registered User
Join Date: May 2010
Location: Reno Ne-VAH-da
Posts: 594
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Re: 350 TBI Engine Miss
if you are sure the plug wires are making good contact pull your plugs and gap them the extra .10, clean them off with a wire brush too. where did you buy the plug wires and tune up parts?
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#6 |
Registered User
Join Date: Oct 2005
Location: Branchville SC
Posts: 1,647
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Re: 350 TBI Engine Miss
Sounds like a cracked plug or cheap parts store wires.
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2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks.. |
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#7 |
Registered User
Join Date: May 2010
Location: Arlington TX
Posts: 9
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Re: 350 TBI Engine Miss
The plugs are AC Delco and the tune-up parts picked up at O'Reilly's.
(putting up my shield to protect against the lashing..lol) |
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#8 |
Registered User
Join Date: May 2010
Location: Arlington TX
Posts: 9
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Re: 350 TBI Engine Miss
deleted...duplicate post???
Last edited by JC_32; 09-22-2010 at 05:04 PM. Reason: duplicate |
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#9 |
Registered User
Join Date: May 2010
Location: Arlington TX
Posts: 9
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Re: 350 TBI Engine Miss
Spudz, what wires do you recommend?
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#10 |
Registered User
Join Date: May 2010
Location: Reno Ne-VAH-da
Posts: 594
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Re: 350 TBI Engine Miss
No big deal and no lashing, i did the same dumb move. The distributor cap i got from orielys melted the button that the rotor made contact with. Take all that bs back to orileys and try to get your money back, then go to Autozone and buy the premium components.
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#11 |
Registered User
Join Date: Oct 2005
Location: Branchville SC
Posts: 1,647
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Re: 350 TBI Engine Miss
ac delco, taylor, moroso, msd, ect.. Nothing from a parts store.
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2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks.. |
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#12 |
Registered User
Join Date: May 2010
Location: Arlington TX
Posts: 9
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Re: 350 TBI Engine Miss
All tune up parts are BWD with AC Delco plugs.
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#13 |
Account Suspended
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Location: Huntsville,AL
Posts: 2,119
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Re: 350 TBI Engine Miss
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