|
|
1990 cadillac deville 4.5 multiport has a miss
|
|
|
| |
|
|
cdwdaddy7
User
Oct 14, 2014, 7:51 PM
Post #1 of 29
(5309 views)
|
|
1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
i just bought it, it hadnt been started for about a year but ran fine when i started it. it says run premium but im cheap and used 87. drove it for about 3 days and now its missing at idle and thoughout driving. plugs and wires are fine. cleaned the throttle body. all injectors are fine, replaced dry rotted vacuum lines. plugs are sooty
(This post was edited by cdwdaddy7 on Oct 14, 2014, 10:07 PM)
|
|
| |
|
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 15, 2014, 4:37 AM
Post #3 of 29
(5284 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
Ditto and been thinking on this car. Did some on a 1992 always cared for. This having set for a year matters totally. First WHY and then how left, indoors garaged or out in the elements?
Fuel would settle and oil would settle to sump that fast - one year and does in brand new cars! Ethanol in the fuel would be on the bottom and oil dry in engine up high. By two years outdoors without antics to store it they usually seize up or need lots of help for running again before even the first crank attempt.
Then you go cheap on octane which is an knock rating not a quality rating and this engine should (who knows now?) adjust itself to the lesser now and then but first time out wasn't such a great idea.
Just how did you determine plugs and wires were OK at all and with dry rotted vacuum lines doesn't seem like this was some cream puff and needed total attention to details before even trying to run it,
T
|
|
| |
|
|
cdwdaddy7
User
Oct 15, 2014, 11:38 AM
Post #4 of 29
(5272 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
just put new plugs and fuel filter on. put a good plug in each wire and all were getting good fire. filled it up with premium gas and injector cleaner. its not knocking anywhere at all. ive worked on cars for years and consider myself pretty good, and so do others. its got me puzzled.
|
|
| |
|
|
cdwdaddy7
User
Oct 15, 2014, 11:40 AM
Post #5 of 29
(5269 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
and i drove it about 150 miles or a few more before it started the miss
|
|
| |
|
|
cdwdaddy7
User
Oct 15, 2014, 12:03 PM
Post #7 of 29
(5263 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
i used a stethescope and all were clicking. when i was working on it the other day i took it for a test drive and when i got back my brother had found a hose laying where the car was parked and it doesnt seem to go to the car and i cant find a good diagram to make sure. its a 3/4" hose thats 4" long with an elbow thats an 1" 1/2" long
|
|
| |
|
|
Hammer Time
Ultimate Carjunky
/ Moderator
Oct 15, 2014, 12:43 PM
Post #8 of 29
(5260 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
The stethoscope trick does not tell you that the injector is not varnished up and plugged.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
|
|
| |
|
|
cdwdaddy7
User
Oct 15, 2014, 1:08 PM
Post #9 of 29
(5257 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
the miss is most noticable at low range gas pedal. like when your barely giving it gas but when you lay down on it it goes with you. has no power out of the hole. can i just pull the injectors and clean them and put them back in with no harm done? i know they are working and i do wonder if maybe they are clogged. you can hear noise inside the muffler while its running, almost like backfiring inside it
(This post was edited by cdwdaddy7 on Oct 15, 2014, 1:28 PM)
|
|
| |
|
|
Hammer Time
Ultimate Carjunky
/ Moderator
Oct 15, 2014, 1:26 PM
Post #10 of 29
(5254 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
How do you propose to do that. The varnish is inside the injector
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
|
|
| |
|
|
cdwdaddy7
User
Oct 15, 2014, 1:29 PM
Post #11 of 29
(5251 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
well how do i tell if any are clogged?
|
|
| |
|
|
Hammer Time
Ultimate Carjunky
/ Moderator
Oct 15, 2014, 4:31 PM
Post #12 of 29
(5245 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
It's not exactly a simple thing to do. You have to perform an injector balance test that requires a very expensive scan tool so the chances of you doing it correctly is very slim.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
|
|
| |
|
|
cdwdaddy7
User
Oct 16, 2014, 4:45 AM
Post #13 of 29
(5237 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
can I just take them all off and clean them myself?
|
|
| |
|
|
Hammer Time
Ultimate Carjunky
/ Moderator
Oct 16, 2014, 6:21 AM
Post #14 of 29
(5227 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
No, the dirt is on the inside, not the outside.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
|
|
| |
|
|
cdwdaddy7
User
Oct 16, 2014, 7:14 AM
Post #15 of 29
(5225 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
so the only way to clean them is to take them and have them cleaned?
|
|
| |
|
|
Hammer Time
Ultimate Carjunky
/ Moderator
Oct 16, 2014, 7:33 AM
Post #16 of 29
(5224 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
They have machines that clean them off the car or there is a pressure cleaning method on the car that works sometimes.
You really need to have it diagnosed properly to see if you even have an injector issue. If you have an issue with one injector, I would just replace it.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
|
|
| |
|
|
cdwdaddy7
User
Oct 16, 2014, 8:25 AM
Post #17 of 29
(5213 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
that seems like the only thing left other than the cat converter. i unplugged the tube running to it yesterday and it ran worse so i would assume it isnt that. could it be my egr?
|
|
| |
|
|
kev2
Veteran
Oct 16, 2014, 8:34 AM
Post #18 of 29
(5210 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
some thoughts-
the octane would NOT change the quality (cleanliness) of the fuel, varnish as likely with one as the other... NOT saying there are no issues using the wrong fuel.
did you check for codes? to easy to ignore
did you check fuel pressure? a basic test
check for vacuum leaks? again BASICS
new spark plugs- what brand? yeah it matters. REPEAT what brand?
what injector cleaner did you use? some are worthless some I use.
Your concern about converter can be answered with VACUUM gauge...
|
|
| |
|
|
Hammer Time
Ultimate Carjunky
/ Moderator
Oct 16, 2014, 11:35 AM
Post #19 of 29
(5179 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
Any injector cleaner added to the fuel will be worthless. They are OK as a preventative but will not cure a problem.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
|
|
| |
|
|
cdwdaddy7
User
Oct 18, 2014, 8:22 AM
Post #20 of 29
(5145 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
if i unplug each injector individually will that tell me if they are getting fuel at least? it will change the way it runs wont it?
|
|
| |
|
|
Hammer Time
Ultimate Carjunky
/ Moderator
Oct 18, 2014, 9:39 AM
Post #21 of 29
(5142 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
Maybe, maybe not.
A trained tech may be able to see the difference but the ISC is going to compensate the RPM right away.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
|
|
| |
|
|
kev2
Veteran
Oct 18, 2014, 10:36 AM
Post #22 of 29
(5135 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
jumping around is not a suggested apporach. yoiu have mentioned filter, plugs, injectors, fuel, cat, EGR ,
did you do any BASICS I suggested- @4 replies above?
Anyway why not disable a spark plug to attempt to isolate a misfire?
injectors are a possibility BUT there are easier and cheaper ways to isolate the issue and cylinders...
|
|
| |
|
|
cdwdaddy7
User
Oct 18, 2014, 1:57 PM
Post #23 of 29
(5129 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
champion plugs and i did try to isolate the cylinder and all plugs and wires are firing good. no codes cleared the ones i had. one was for freon and the other was from the one time that it stalled. none since
|
|
| |
|
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 18, 2014, 2:33 PM
Post #24 of 29
(5125 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
Question by kev2 back a few posts">>new spark plugs- what brand? yeah it matters. REPEAT what brand?<<"
OE = AC Delco or you can have problem which is why he asked. May only be my opinion but Champion is great for a lawnmower and about ends there,
T
|
|
| |
|
|
cdwdaddy7
User
Oct 19, 2014, 6:46 AM
Post #25 of 29
(5115 views)
|
|
Re: 1990 cadillac deville 4.5 multiport has a miss
|
Sign In
|
|
i like delco to but they are way over priced. ive used champions in everything ive ever had for the last 20 years and never had a foul or fire problem.they are all getting great fire.i pulled injectors and cleaned them internally yesterday. 2 were clogged and one is bad. getting the replacement one this week.
|
|
| |
|
Auto Repair Home
SEARCH
WHO'S 
LOG 
2006 Toyoto Camry XLE Driver Side Electric Window Trouble
Tierod end change caused some kind of leak
Grounding Cable, 2017 Jeep Renegade Trailhawk
equipment
Howdy
1
