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06-18-2014
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#1 |
 
Join Date: Aug 2004
Location: Wichita, KS
Posts: 22
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Severe Stumble Intermittingly on my 90
My 90 is getting a severe stumble which feels as though I am getting no fuel every time it happens. Has never had an issue to this point. New injectors, new plugs about 1 year ago, and has run flawlessly up til now. Everytime the stumble happens I see the Check Engine light come on briefly. It simply feels like a fuel delivery issue, and am wondering if the fuel pump could be the culprit? The first several times it did it, I drove for awhile and it stopped doing it and drove fine from the rest of the drive. The last time out was by far the worst, and pretty on and off stumbled until I got it back home. Let it rest and fired up again, idled it at 2500-3000 and never a stumble. I have 35,000 miles on it, and it has always been garage stored. Would it be a good idea to change out Fuel Pump if for no other reason as preventive? It seems as though I have read about many fuel pump issues. Any help/suggestions would be most appreciated.
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1990 Red/Tan Mark Haibeck Chip/B & B |
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06-18-2014
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#2 |
 
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Severe Stumble Intermittingly on my 90
Sounds like the same problem I'm having with mine. Have you checked the codes? Mine was code 61, vac leak. I've narrowed it down to a bad check valve or secondary solenoid under the plenum
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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06-18-2014
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#3 |
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Join Date: Aug 2004
Location: Wichita, KS
Posts: 22
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Re: Severe Stumble Intermittingly on my 90
No haven't checked the codes yet. I was hoping it wasn't vacuum related. I will pull codes and see what I get.
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1990 Red/Tan Mark Haibeck Chip/B & B |
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06-18-2014
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#4 |
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Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Severe Stumble Intermittingly on my 90
pulling the codes is the best place to start, that way we can focus on what's wrong vs just guessing and hoping for the right answer. If it is vacuum it's not a huge deal. Still easy to sort out. Let's hope it's something simple and we can get you up and running again soon.
Has any work been done to the car recently? Does it run better with the key off vs on? Mine runs fine with the key off but stumbles like crazy with the key on.
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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06-18-2014
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#5 |
 
Join Date: Sep 2013
Location: Charlotte NC
Posts: 655
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Re: Severe Stumble Intermittingly on my 90
Make sure the plug wire boots are filled with Di-electric grease. Sounds like an arcing mis-fire.
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06-18-2014
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#6 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,786
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Re: Severe Stumble Intermittingly on my 90
Fuel pressure; static, dynamic, and leakdown time. Dynamic with vac supply to FPR on, and off...
Quote:
__________________
I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG] |
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06-18-2014
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#7 | |
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Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Severe Stumble Intermittingly on my 90
Quote:
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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06-18-2014
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#8 |
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Join Date: Aug 2004
Location: Wichita, KS
Posts: 22
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Re: Severe Stumble Intermittingly on my 90
Both good points, and I have not tried running it without secondary key in off position. I actually am a little nervous to take it out for a drive after the amount of stumbling I saw before, but it would be worth trying it without the secondary key on. Curious though, how if I have a possible vacuum issue, why it will run for periods of time perfectly and then only intermittingly stumble?
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1990 Red/Tan Mark Haibeck Chip/B & B |
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06-18-2014
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#9 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,786
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Re: Severe Stumble Intermittingly on my 90
I suggested that Kevin, since he was thinking of replacing the fuel pump, without checking pressure...
Yeah - codes FIRST (I missed CEL note); OP; codes are in History DTC Hxx Module (1?) [ECM] Quote:
__________________
I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG] |
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06-18-2014
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#10 | |
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Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Severe Stumble Intermittingly on my 90
Quote:
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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