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Old 03-28-2018, 10:09 PM   #1
Lilfoot86
 
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Default 1986 d21 starts then dies

So I inherited my grandpa's 86 Nissan lil foot. I changed head gasket, timing chain and gears, foundead injector and replaced it. Now truck starts but then dies showing no codes but acts like it's starved for fuel. If I start with throttle all the way open it will rev up just fine until I let it go down to idle then it just dies and If I step on the throttle it will immediately die. I can feather the throttle but it still cuts out. Fuel pump has good pressure I'm at a loss and it is driving me crazy any help is much appreciated
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Old 03-28-2018, 11:13 PM   #2
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Sounds like the timing is off. Did you have the engine at TDC on the compression stroke on the #1 cylinder? Were the chain links lined up correctly with the dots? Was the oil pump/distributor shaft installed in the correct position?
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Old 03-28-2018, 11:31 PM   #3
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Timing is right I should have said too that if I spray with starting fluid it idles and runs perfect what I'm stuck on is if I floor it while starting it starts and runs right until I let rpms go down then if I feather the gas it will stay rev up slightly then die unless I pump gas again and it will do the same but like i said if I start it with throttle all the way open I can rev it up and down just fine until I let it go down to idle then it idles kinda high for a few seconds and dies I'm sorry but this is kinda hard to explain and it's driving me crazy
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Old 03-28-2018, 11:43 PM   #4
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I just went thru something similar. I pulled my timing cover to replace the timing parts and forgot to put the PCV hose back on the valve when I reassembled.

The truck would fire right up but would soon start to cough and then die. If I hit the gas pedal the truck would continue to run and rev'd right up but wouldn't stay running.

Good luck

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Old 03-29-2018, 12:14 AM   #5
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Yeah, could be a huge vacuum leak.
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Old 03-29-2018, 12:18 AM   #6
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I was wondering if vacuum leak would be culprit I haven't started connecting all of the airlines yet this truck set for several years and someone else took head off before I got it so I'm having to piece it back together without knowing where all of the air lines go so which lines do I have to have to run and which ones can I delete
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Old 03-29-2018, 12:45 AM   #7
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You can pretty well remove every vacuum line from the engine bay. You might want to keep the brake booster line. I also kept the AB valve line. I have no other vacuum lines.
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Old 03-29-2018, 12:51 AM   #8
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Could tps or maf cause injectors to not pump enough fuel
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Old 03-29-2018, 07:18 AM   #9
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Quote:
Originally Posted by Lilfoot86 View Post
Timing is right I should have said too that if I spray with starting fluid it idles and runs perfect what I'm stuck on is if I floor it while starting it starts and runs right until I let rpms go down then if I feather the gas it will stay rev up slightly then die unless I pump gas again and it will do the same but like i said if I start it with throttle all the way open I can rev it up and down just fine until I let it go down to idle then it idles kinda high for a few seconds and dies I'm sorry but this is kinda hard to explain and it's driving me crazy
This sounds like a serious vacuum leak, especially if you aren't tossing any Check Engine codes. If all else fails, you could drop about $100-150 on a good shop and MAKE them run the smoke machine test and a general diagnostic. Make sure they DO. It will show where the vacuum leak is. Don't let them BS you, either. Make sure they actually HAVE a smoke machine, and that they DO run the test with it. These trucks generally aren't that hard to fix, but occasionally you need a pro to tell you what the hell is wrong. Not often, but it happens. Then you can fix it if you know what is actually wrong. Just make sure they do what you want them to do, and no BS on it. It's your diagnostic money, and baby...you got RIGHTS for that money. Slap them around like red-haired stepchildren and make them find out what's wrong. Make sure to get a printed report on the results.
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Old 03-29-2018, 03:52 PM   #10
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I'm outta town right now but when I get home tomorrow I'm gonna start looking for vacuum leaks thanks for the help guys it's much appreciated
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