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03-22-2009, 07:47 PM
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#1
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AF Newbie
Join Date: Mar 2009
Location: Connaut, Ohio
Posts: 22
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1994 S10 Blazer confusion
My '94 S10 Blazer has a problem, it starts, runs but when is revved or put in gear and try to move it the engine first lopes badly then stalls. I have Checked Fuel pressure and is range.. new cpi spider, distributor good, ignition module good, ecm operating as it should, tps working, no vaccum leaks, and the intake and plenum have new gaskets. Map sensor working properlyand timing is right. What could possibly be my problem? beforei for get it is 4.3 cpi vin # w with 140k miles
Last edited by disembodiedsoul; 03-22-2009 at 07:58 PM.
Reason: forgot mile age
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03-22-2009, 08:48 PM
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#2
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,096
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Re: 1994 S10 Blazer confusion
Start with the basics: What is the fuel pressure and leakdown rate?
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03-22-2009, 08:55 PM
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#3
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AF Newbie
Join Date: Mar 2009
Location: Connaut, Ohio
Posts: 22
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Re: 1994 S10 Blazer confusion
when runing it holds 60-63 and when not runnin 56-58
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03-22-2009, 09:04 PM
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#4
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,096
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Re: 1994 S10 Blazer confusion
94 4.3L "W" engine fuel pressure spec is 55psi to 61psi with the key on, engine cold and off. There is no published "engine running" fuel pressure specs, (far too many variables involved). Your pressure is fine, what is the leakdown rate? Fuel pressure must remain above 50psi for 3 to 5 minutes.
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03-22-2009, 09:09 PM
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#5
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AF Newbie
Join Date: Mar 2009
Location: Connaut, Ohio
Posts: 22
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Re: 1994 S10 Blazer confusion
fuel pressure indefinatly stays above 55psi
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03-22-2009, 09:09 PM
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#6
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,096
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Re: 1994 S10 Blazer confusion
Have you checked/adjusted ignition timing?
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03-22-2009, 09:11 PM
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#7
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AF Newbie
Join Date: Mar 2009
Location: Connaut, Ohio
Posts: 22
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Re: 1994 S10 Blazer confusion
yes base timing is good
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03-22-2009, 09:14 PM
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#8
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,096
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Re: 1994 S10 Blazer confusion
O degrees with the EST wire disconnected, (tan wire with black stripe taped to wire harness near the distributor)?
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03-22-2009, 09:17 PM
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#9
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AF Newbie
Join Date: Mar 2009
Location: Connaut, Ohio
Posts: 22
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Re: 1994 S10 Blazer confusion
yes and before i would forget it had set off codes 22 and 34 tps voltage low and map voltage low, a possible short? and a code 83?
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03-22-2009, 09:19 PM
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#10
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,096
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Re: 1994 S10 Blazer confusion
What order did the DTC's appear when you retrieved them?
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03-22-2009, 09:47 PM
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#11
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AF Newbie
Join Date: Mar 2009
Location: Connaut, Ohio
Posts: 22
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Re: 1994 S10 Blazer confusion
83 then 22 and then 34
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03-22-2009, 10:18 PM
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#12
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,096
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Re: 1994 S10 Blazer confusion
83 is for reverse inhibit system on vehicles equipped with manual transmission only. That DTC will not turn on the SES.
22 indicates the TPS showed less than .2 volts and 34 indicates no MAP signal was received at the ECM.
If either sensor was disconnected with the ignition in the RUN position, it will set these codes. If that's not the case, look for an open, not shorted, circuit for the TPS and the MAP sensors.
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03-22-2009, 10:26 PM
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#13
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AF Newbie
Join Date: Mar 2009
Location: Connaut, Ohio
Posts: 22
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Re: 1994 S10 Blazer confusion
ok thank you for you help and i was out and did find some one had hacked into the wirin harness. and would that be the purple wires i saw corroded?
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03-23-2009, 05:09 PM
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#14
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,096
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Re: 1994 S10 Blazer confusion
The MAP sensor has 3 wires: Light green, Purple, & grey.
The TPS also has 3 wires: Dark blue, Black, & grey.
Repair them by soldering, not crimp connectors, and use heat shrink tube to insulate/weatherproof them. Post your results.
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03-23-2009, 07:19 PM
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#15
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AF Newbie
Join Date: Mar 2009
Location: Connaut, Ohio
Posts: 22
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Re: 1994 S10 Blazer confusion
results are the same is it possonle some one replaced the engine with a '93 if so si that engine comatible with a 94 wire harness??
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