Engine trouble on the DD, Looking for ideas |
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Engine trouble on the DD, Looking for ideas |
Aug 15 2011, 11:23 PM
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#1
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Experienced Member Group: Advanced Members Posts: 1,197 Joined: 13-February 04 From: Hudson, Colorado Member No.: 197 |
My daily driver is an 88 Buick Park Ave. Lately, I've been having trouble with it running right when the engine is hot and I restart it. Almost seems to be vapor locking, but it's multiport fuel injection. Ocationally when this happens, I can bleed some "air" or maybe fuel vapor out of the schrader valve on the rail which sometimes helps, sometimes not. It starts, then idles like it's missing badly and the engine won't rev up. So far, I've been able to coax it into working and getting me where I need to go, but I at a bit of a loss as to why this is happening all of a sudden (the last week or so). The weather hasn't been too bad lately and it was certainly hotter earlier in the summer and it ran fine. It seems OK while I'm driving and after it's been allowed to cool down all the way.
The recent maintenance includes: new fuel filter new plugs new coil packs and igniton contol module Removed and cleaned injectors (really were pretty clean to begin with) My ideas: fuel pump is low on pressure allowing the fuel to vaporize in the rail while sitting after driving Bad presure regulator not holding the pressure up while sitting after driving, or sticking not allowing the vapor to exit and return to the tank. Any insight or ideads would be appreciated. |
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Aug 20 2011, 09:58 PM
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#2
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Member Group: Advanced Members Posts: 136 Joined: 4-September 10 From: Chicagoland Member No.: 20,108 |
Yep 12 is normal...
The 41 can be a problem though. Cam sensor can cause a weird starting issue. Lack of a CKP (cam sensor)signal can keep the ECM from being able to run the injectors sequentially & it reverts to batch fire. Check the magnet again, take the crank sensor out & look thru the hole with a small mirror. The cam sensor is wired thru the crank sensor & then goes to the igntion module. So check all that wiring, & the connectors. This post has been edited by wrencher: Aug 20 2011, 09:58 PM |
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