"91 Chevy pickup, with replacement engine will only stay running with pressure to the accelerator.Any Ideas?
Posted on Nov 13, 2008 under replacement auto parts |I already replaced distributor cap, spark plugs and wires, map sensor, fuel injector but it will not stay running without giving it gas.When it does run, it loops. Replacement engine was purchased from Advanced Auto Parts
have you tried adjusting the idle speed?
By Robert on Nov 14, 2008 | Reply
have you tried adjusting the idle speed?
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By Michael S on Nov 14, 2008 | Reply
Vacume hose off the Timeing advance silinoid .
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By hardly_d on Nov 14, 2008 | Reply
Hmm the answer above this one about the idle speed is a good one..also check the timing on this puppy..sometimes things are over looked in doing total replacements
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By Mad Jack on Nov 14, 2008 | Reply
The engine is fuel injected.
The idle speed is controlled by the engine management computer and can not be adjusted.
Check that the idle air control valve. It is located on the throttle body. Make sure that it is connected and working. Check that the wiring was not damaged during the engine swap.
If all that was correct, possible the camshaft was installed incorrectly when the engine was rebuilt. Place #1 piston at top dead center. Remove the water pump, harmonic balancer, and timing cover. Check that the timing marks on the timing chain sprockets are correctly aligned.
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By done wrenching on Nov 14, 2008 | Reply
Check the distrib timing.set it at 0 BTDC (you have to disconnect the tan w/black wire at pass side firewall). Also you could have egr sticking open or vacuum leak.
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By deltech on Nov 14, 2008 | Reply
Be sure timing was set correctly If that cks out good i would look at fuel pressure. should be 14 psi to run right .specs call for 9 to 14 but thats misleading .Most TBI engines need 14 lbs
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By Sparky on Nov 14, 2008 | Reply
Sounds like a vacuum leek or bad gasket.
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By stallion1948_lloyd on Nov 14, 2008 | Reply
if it lopes then its probably a vacume leak somewhere.try checking vacume hoses.
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By George K on Nov 14, 2008 | Reply
you have your vacuum hoses crossed.
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By Trisha on Nov 14, 2008 | Reply
does sound like a vaccum leak but may also be the pick up coil in the distributor, try unplugging the link connector for the timing to the distributor if it runs better replace pickup coil. The link connector is located on the passenger side firewall behind the relay cover
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By W M on Nov 14, 2008 | Reply
Check for a bad/broken/disconnected/hiding vacuum hose. From what you have said it probably won't be a little one.
Did you forget to hook up the brake booster?
Ideas:
PCV
Idle air motor
Intake manifold gasket (did you use the "end pieces"? They squeeze out and leak!)
I would check the timing too, should be about 10 degrees advanced.
Firing order 1-8-4-3-6-5-7-2 Clockwise
Insufficient Fuel pressure (pump/filter/regulator)
EGR leak/disconnected?
Bring it on over to my house, we can fix it!
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Mechanic/ASE Parts Specialist