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12-12-2013
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#71 |
  
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,806
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Re: 1990 Throttle hesistation
Are you pointing to a page in the infamous FSM that WVZR-1 always refers to?
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12-12-2013
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#72 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: 1990 Throttle hesistation
Quote:
The answer's right there, and I ain't gettin' it. Last edited by Schrade; 12-12-2013 at 10:37 PM. |
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12-12-2013
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#73 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,683
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Re: 1990 Throttle hesistation
Sounds like a lean surge to me. What % TPS was that? Did this start after the secondary elimination?
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12-12-2013
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#74 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: 1990 Throttle hesistation
Quote:
I'm thinking perhaps lean surge also - only FP test I didn't do was FPR vacuum response. FSM says apply 10" Hg. vac lift, and observe... |
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12-12-2013
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#75 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,683
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Re: 1990 Throttle hesistation
Ever change the fuel filter under passenger side firewall?
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12-12-2013
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#76 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: 1990 Throttle hesistation
Quote:
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12-13-2013
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#77 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: 1990 Throttle hesistation
Quote:
I'm gonna' try to set up the throttle stop screw accessible, to incrementally increase throttle. So how about INJ resistance test? Can they be tested at the ECM terminals? I suppose if they ohm through near 16 Ohms, all are good, and it they ohm UNDER spec, it could still be the leads TO the INJ's... Cold AND warmed up test? Last edited by Schrade; 12-13-2013 at 02:49 PM. |
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12-13-2013
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#78 |
 Join Date: May 2013
Location: Beaver, PA
Posts: 515
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Re: 1990 Throttle hesistation
Schrade,
Not sure this is your problem. All 16 of my injectors measured about 12-13 ohms cold. None were at 16 ohms. When hot, 4 of them measured anywhere from 6-10 ohms. They were the bad ones. 1 Primary and 3 secondary. The symptoms was a good idling engine until warmed up. Then a miss as the 1 primary injector started to fail. Since I had 3 bad injectors on the secondary side there was no effect until secondary operation. There was no regular hesitation as you are describing. The primaries can be tested at the ECM but the secondary's are not measured at the ECM. Marc Haibeck published a procedure on how its done which I followed. Last edited by Franke; 12-13-2013 at 05:17 PM. |
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12-14-2013
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#79 |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: 1990 Throttle hesistation
Anyone know where the pinout ID is in FSM for ECM?
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12-14-2013
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#80 | ||
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Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,806
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Fuel Injector Resistance plenum In Place
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Measuring Fuel Injector Resistance with the Plenum in Place Marc says: 1. The primary fuel injectors have a common connection at the Inj 1 fuse. Resistance measurements can be made between the fuse connector and the individual connections on ECM connector A. 2. The secondary fuel injector resistance is measured between the ECM A connector and the secondary relay connectors. Remove the secondary relay connectors for easy access to the pins. As Franke suggests..... Quote:
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