How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Matt Your Own Question
Matt, Engineer
Category: Nissan
Satisfied Customers: 21360
Experience:  BEng hons Mech engineering, worked in auto industry for 22 years on engine, transmission and suspension design
Type Your Nissan Question Here...
Matt is online now
A new question is answered every 9 seconds

I have a 87 Nissan hardbody with a VG30i and it had a 32/36

Customer Question

Hey I have a 87 Nissan hardbody with a VG30i and it had a 32/36 Weber on it and it was running rough. I was told that you couldn't put a Weber on the truck due to the ecu not reading the carborater. I finally tracked down the stock one for my truck and put it on. The truck starts for a little while then dies, any reason why it will do this?
Submitted: 7 months ago.
Category: Nissan
Expert:  Matt replied 7 months ago.


OK if you have now fitted the stock carb but it won't stay running then I'd 1st check for vacuum leaks after the carb

The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane or brake cleaner around each joint in turn. If the engine rev's up you've found your leak.

Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.

Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

Customer: replied 7 months ago.
Okay, I have the truck running now but I'm having trouble tuning/timing it.
The truck runs, but it feels like it doesn't have the power it should.
Do you set the timing first or do you tune the valve body? Also is there a specific way to set the timing/ tune it?
Expert:  Matt replied 7 months ago.


I'd next set the ignition timing up with a warm engine

disconnect any vacuum advance to the distributor and then use a strobe light to set the timing up at around 8 to 10 degrees BTDC

Expert:  Matt replied 6 months ago.


do you still need help?

Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you

Related Nissan Questions