no oil pressure
04-13-2011, 10:00 AM
#1
TECH Enthusiast
Thread Starter
iTrader: (18)
Join Date: Jan 2007
Location: the chi/ addison Il
Posts: 541
Likes: 0
Received 0 Likes
on
0 Posts
no oil pressure Well I know what you guys are thinking not another one of these threads. well anyway I ll keep ot short and I appreciate all the help I get. so I bought an 2003 lq4 and swapped it into my 99. I started it and fired up great great but no oil pressure.
so far I have checked to the oring, front plug next to the oil pump and hooked up a mechanical gauge. my next approach is replace the pump and check the cam thrust cover. I know their is a barbel plug at the back of the engine and that will be my last resort cuz I don't want to pull the motor again. am I missing anything else I should check. thanks again.
so far I have checked to the oring, front plug next to the oil pump and hooked up a mechanical gauge. my next approach is replace the pump and check the cam thrust cover. I know their is a barbel plug at the back of the engine and that will be my last resort cuz I don't want to pull the motor again. am I missing anything else I should check. thanks again.
04-13-2011, 10:09 AM
#3
TECH Resident
iTrader: (2)
Join Date: Sep 2010
Location: Salisbury, NC
Posts: 909
Likes: 0
Received 0 Likes
on
0 Posts
he said he hooked up a mechanical gauge. I think you have a good plan so far. Didyou just swap in the whole motor? Didnt mess with the oring doing a cam right?
04-13-2011, 10:29 AM
#4
TECH Enthusiast
Thread Starter
iTrader: (18)
Join Date: Jan 2007
Location: the chi/ addison Il
Posts: 541
Likes: 0
Received 0 Likes
on
0 Posts
No I did swapped a zo6 cam cuz I gonna boost it. I also studded the mains and added rod bolts. Nothing I haven't done before. But I know the oring is good its brand new. The pump has 500 miles was in my last motor that blew right away from a bad rod.
04-13-2011, 11:01 AM
#5
TECH Resident
iTrader: (2)
Join Date: Sep 2010
Location: Salisbury, NC
Posts: 909
Likes: 0
Received 0 Likes
on
0 Posts
pump may have sucked up some metal and killed it when that old motor blew. Id just change that. the tolerances are so close a scratch in the wrong place will kill a pump
Trending Topics
04-13-2011, 06:51 PM
#8
Did u prime it with out the motor running? If that barbel is missing you still would see very little pressure. Try priming it with the fuel shut off. Crank for 10 sec three times let the starter cool for 5 mins and try again. If you have no oil then somthing is up. Oh remove the pressure sender unit while doing this.
04-13-2011, 07:06 PM
#11
TECH Enthusiast
Thread Starter
iTrader: (18)
Join Date: Jan 2007
Location: the chi/ addison Il
Posts: 541
Likes: 0
Received 0 Likes
on
0 Posts
BTW the barbel should be in since it was pulled as a running motor but i don't know for sure. Also the mechanical gauge is hooked up by the filter with a clear plastic line. Oil isn't pumping into really hence why I think priming issue
04-13-2011, 07:09 PM
#12
TECH Resident
iTrader: (2)
Join Date: Sep 2010
Location: Salisbury, NC
Posts: 909
Likes: 0
Received 0 Likes
on
0 Posts
someone correct me if im wrong but first place it goes is to the filter so it has to be somewhere before that! id pull the plugs and unplug the coils and just spin the thing over. It still should be instant when you crank the motor
04-13-2011, 10:22 PM
#15
TECH Enthusiast
Thread Starter
iTrader: (18)
Join Date: Jan 2007
Location: the chi/ addison Il
Posts: 541
Likes: 0
Received 0 Likes
on
0 Posts
Oh and I had a clogged filter. Gotta love frams. Open to anymore suggestions, above are the only plugs I m familiar with so Idk what else I should check
04-14-2011, 07:15 AM
#17
TECH Enthusiast
Thread Starter
iTrader: (18)
Join Date: Jan 2007
Location: the chi/ addison Il
Posts: 541
Likes: 0
Received 0 Likes
on
0 Posts
I have oil moving to the filter but still no pressure. Well maybe 1 psi, we use a real small gauge. So today I think I might drop the engine and go after the barbel. Hopefully that's what's missing if not I ll already have the motor down and can go from there.
04-14-2011, 11:58 AM
#19
On The Tree
Join Date: Mar 2010
Location: SpringCity Tn
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
How did you tq ur main caps? I just went threw a similar issue, altho mine was brand new. I bought mine from an idiot tho, he tried re-using the tq ill main bolts and had 6 out of 8 rods in backwards. But when I re-assembled my motor with arp studs, 1st I done a 3step tq sequence, check clearances and it had .005, which is out of tolerance, so I back it off and done it in 4 steps and it brought it down to .002 which was right. But after I did the re-build I got oil pressure now.